Calendaring Extensions

Internet Engineering Task Force (IETF)                       R. Stepanek
Internet-Draft
Request for Comments: 9553                                      Fastmail
Intended status:
Category: Standards Track                                    M. Loffredo
Expires: 12 May 2024
ISSN: 2070-1721                                                  IIT-CNR
                                                         9 November 2023
                                                              March 2024

            JSContact: A JSON representation Representation of contact data
                     draft-ietf-calext-jscontact-16 Contact Data

Abstract

   This specification defines a data model and JSON JavaScript Object
   Notation (JSON) representation of contact card information that can
   be used for data storage and exchange in address book or directory
   applications.  It aims to be an alternative to the vCard data format
   and to be unambiguous,
   extendable extendable, and simple to process.  In
   contrast to the JSON-based jCard format, it is not a direct mapping
   from the vCard data model and expands semantics where appropriate.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list  It represents the consensus of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid the IETF community.  It has
   received public review and has been approved for a maximum publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

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   This Internet-Draft will expire on 12 May 2024.
   https://www.rfc-editor.org/info/rfc9553.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Motivation and Relation to vCard, jCard jCard, and xCard . . . .   5
     1.2.  Notational Conventions  . . . . . . . . . . . . . . . . .   5
     1.3.  Data Type Notations . . . . . . . . . . . . . . . . . . .   6
       1.3.1.  Objects and Properties  . . . . . . . . . . . . . . .   6
       1.3.2.  Type Signatures . . . . . . . . . . . . . . . . . . .   7
       1.3.3.  Property Attributes . . . . . . . . . . . . . . . . .   7
       1.3.4.  The @type Property  . . . . . . . . . . . . . . . . .   8
     1.4.  Common Data Types . . . . . . . . . . . . . . . . . . . .   8
       1.4.1.  Id  . . . . . . . . . . . . . . . . . . . . . . . . .   9
       1.4.2.  Int and UnsignedInt . . . . . . . . . . . . . . . . .   9
       1.4.3.  PatchObject . . . . . . . . . . . . . . . . . . . . .   9
       1.4.4.  Resource  . . . . . . . . . . . . . . . . . . . . . .  10
       1.4.5.  UTCDateTime . . . . . . . . . . . . . . . . . . . . .  11
     1.5.  Common Properties . . . . . . . . . . . . . . . . . . . .  12
       1.5.1.  contexts  . . . . . . . . . . . . . . . . . . . . . .  12
       1.5.2.  extra . . . . . . . . . . . . . . . . . . . . . . . .  12
       1.5.3.  label . . . . . . . . . . . . . . . . . . . . . . . .  12
       1.5.4.  pref  . . . . . . . . . . . . . . . . . . . . . . . .  13
       1.5.5.  phonetic  . . . . . . . . . . . . . . . . . . . . . .  13
     1.6.  Internationalization  . . . . . . . . . . . . . . . . . .  14
       1.6.1.  Free-form text  . . . . . . . . . . . . . . . . . . .  14  Free-Form Text
       1.6.2.  URIs  . . . . . . . . . . . . . . . . . . . . . . . .  15
     1.7.  Validating JSContact  . . . . . . . . . . . . . . . . . .  15
       1.7.1.  Case-Sensitivity  . . . . . . . . . . . . . . . . . .  15
       1.7.2.  IANA-registered  IANA-Registered Properties  . . . . . . . . . . . . .  16
       1.7.3.  Unknown Properties  . . . . . . . . . . . . . . . . .  16
       1.7.4.  Enumerated Values . . . . . . . . . . . . . . . . . .  16
     1.8.  Vendor-Specific Extensions  . . . . . . . . . . . . . . .  17
       1.8.1.  Vendor-specific  Vendor-Specific Properties  . . . . . . . . . . . . .  17
       1.8.2.  Vendor-specific  Vendor-Specific Values  . . . . . . . . . . . . . . .  18
     1.9.  Versioning  . . . . . . . . . . . . . . . . . . . . . . .  19
       1.9.1.  Version Format and Requirements . . . . . . . . . . .  19
       1.9.2.  Current Version . . . . . . . . . . . . . . . . . . .  19
   2.  Card  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
     2.1.  Metadata Properties . . . . . . . . . . . . . . . . . . .  20
       2.1.1.  @type . . . . . . . . . . . . . . . . . . . . . . . .  20
       2.1.2.  version . . . . . . . . . . . . . . . . . . . . . . .  20
       2.1.3.  created . . . . . . . . . . . . . . . . . . . . . . .  20
       2.1.4.  kind  . . . . . . . . . . . . . . . . . . . . . . . .  21
       2.1.5.  language  . . . . . . . . . . . . . . . . . . . . . .  21
       2.1.6.  members . . . . . . . . . . . . . . . . . . . . . . .  21
       2.1.7.  prodId  . . . . . . . . . . . . . . . . . . . . . . .  22
       2.1.8.  relatedTo . . . . . . . . . . . . . . . . . . . . . .  22
       2.1.9.  uid . . . . . . . . . . . . . . . . . . . . . . . . .  24
       2.1.10. updated . . . . . . . . . . . . . . . . . . . . . . .  24
     2.2.  Name and Organization Properties  . . . . . . . . . . . .  25
       2.2.1.  name  . . . . . . . . . . . . . . . . . . . . . . . .  25
       2.2.2.  organizations . . . . . . . . . . . . . . . . . . . .  30
       2.2.3.  speakToAs . . . . . . . . . . . . . . . . . . . . . .  31
       2.2.4.  titles  . . . . . . . . . . . . . . . . . . . . . . .  32
     2.3.  Contact Properties  . . . . . . . . . . . . . . . . . . .  33
       2.3.1.  emails  . . . . . . . . . . . . . . . . . . . . . . .  33
       2.3.2.  onlineServices  . . . . . . . . . . . . . . . . . . .  34
       2.3.3.  phones  . . . . . . . . . . . . . . . . . . . . . . .  35
       2.3.4.  preferredLanguages  . . . . . . . . . . . . . . . . .  37
     2.4.  Calendaring and Scheduling Properties . . . . . . . . . .  38
       2.4.1.  calendars . . . . . . . . . . . . . . . . . . . . . .  38
       2.4.2.  schedulingAddresses . . . . . . . . . . . . . . . . .  38
     2.5.  Address and Location Properties . . . . . . . . . . . . .  39
       2.5.1.  addresses . . . . . . . . . . . . . . . . . . . . . .  39
     2.6.  Resource Properties . . . . . . . . . . . . . . . . . . .  44
       2.6.1.  cryptoKeys  . . . . . . . . . . . . . . . . . . . . .  45
       2.6.2.  directories . . . . . . . . . . . . . . . . . . . . .  45
       2.6.3.  links . . . . . . . . . . . . . . . . . . . . . . . .  46
       2.6.4.  media . . . . . . . . . . . . . . . . . . . . . . . .  47
     2.7.  Multilingual Properties . . . . . . . . . . . . . . . . .  48
       2.7.1.  localizations . . . . . . . . . . . . . . . . . . . .  48
     2.8.  Additional Properties . . . . . . . . . . . . . . . . . .  50
       2.8.1.  anniversaries . . . . . . . . . . . . . . . . . . . .  50
       2.8.2.  keywords  . . . . . . . . . . . . . . . . . . . . . .  52
       2.8.3.  notes . . . . . . . . . . . . . . . . . . . . . . . .  52
       2.8.4.  personalInfo  . . . . . . . . . . . . . . . . . . . .  53
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  54
     3.1.  Media Type Registration . . . . . . . . . . . . . . . . .  54
     3.2.  Creation of the "JSContact" JSContact Registry Group  . . . . . . .  56
     3.3.  Registry Policy and Change Procedures . . . . . . . . . .  56
       3.3.1.  Preliminary Community Review  . . . . . . . . . . . .  57
       3.3.2.  Submit Request to IANA  . . . . . . . . . . . . . . .  57
       3.3.3.  Designated Expert Review  . . . . . . . . . . . . . .  57
       3.3.4.  Change Procedures . . . . . . . . . . . . . . . . . .  58
     3.4.  Creation of the "JSContact Version" JSContact Version Registry  . . . . . .  58
       3.4.1.  "JSContact Version"  JSContact Version Registry Template . . . . . . . .  58
       3.4.2.  Initial Contents for of the "JSContact Version" JSContact Version Registry  . . . . . . . . . . . . . . . . . . . . . .  59
     3.5.  Creation of the "JSContact Properties" JSContact Properties Registry . . . . .  59
       3.5.1.  "JSContact Properties"  JSContact Properties Registry Template  . . . . . .  59
       3.5.2.  Initial Contents for of the "JSContact Properties" JSContact Properties Registry  . . . . . . . . . . . . . . . . . . . . . .  60
     3.6.  Creation of the "JSContact Types" JSContact Types Registry  . . . . . . .  69
       3.6.1.  "JSContact Types"  JSContact Types Registry Template . . . . . . . . .  69
       3.6.2.  Initial Contents for of the "JSContact Types" JSContact Types Registry  . . . . . . . . . . . . . . . . . . . . . .  70
     3.7.  Creation of the "JSContact JSContact Enum Values" Values Registry  . . . .  72
       3.7.1.  "JSContact  JSContact Enum Values" Values Registry Property Template  .  72
       3.7.2.  "JSContact  JSContact Enum Values" Values Registry Value Template . . .  73
       3.7.3.  Initial Contents for of the "JSContact JSContact Enum Values" Values Registry  . . . . . . . . . . . . . . . . . . . . . .  73
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  82
     4.1.  JSON Parsing  . . . . . . . . . . . . . . . . . . . . . .  82
     4.2.  URI Values  . . . . . . . . . . . . . . . . . . . . . . .  83
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  83
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .  83
     5.2.  Informative References  . . . . . . . . . . . . . . . . .  85
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  87

1.  Introduction

   This document defines a data model for contact card data normally
   used in address book or directory applications and services.  It aims
   to be an alternative to the vCard data format [RFC6350].

   The key design considerations for this data model are as follows:

   *  The data model and set of attributes should mostly be mostly compatible
      with the one model defined for the vCard data format [RFC6350] and
      extensions ([RFC6473], [RFC6474], [RFC6715], [RFC6869],
      [RFC8605]). [RFC6473] [RFC6474] [RFC6715] [RFC6869] [RFC8605].  The
      specification should add new attributes or value types where
      appropriate.  Not all existing vCard definitions need an
      equivalent in JSContact, especially if the vCard definition is
      considered to be obsolete or otherwise inappropriate.  Conversion
      between the data formats need not fully preserve semantic meaning.

   *  The attributes of the card data represented must be described as
      simple key-value pairs, reducing complexity of their
      representation.

   *  The data model should avoid all ambiguities and make it difficult
      to make mistakes during implementation.

   *  Extensions, such as new properties and components, MUST NOT lead
      to requiring an a required update to of this document.

   The representation of this data model is defined in the I-JSON Internet JSON
   (I-JSON) format [RFC7493], which is a strict subset of the JavaScript Object Notation
   (JSON) Data Interchange Format JSON data
   interchange format [RFC8259].  Using JSON is mostly a pragmatic
   choice: its widespread use makes JSContact easier to adopt, and the
   availability of production-ready JSON implementations eliminates a
   whole category of parser-related interoperability issues.

1.1.  Motivation and Relation to vCard, jCard jCard, and xCard

   The vCard data format [RFC6350] is an interchange format for contacts
   data between address book service providers and vendors.  However,
   this format has gone through multiple specifications specification iterations with
   only a subset of its deprecated version 3 [RFC2426] being widely in
   use.  Consequently, products and services internally use a richer an internal contact
   data model that is richer than what they expose when serializing that
   information to vCard.  In addition, service providers often use a
   proprietary JSON representation of contact data in their APIs.

   JSContact provides a standard JSON-based data model and
   representation of contact data as an alternative to proprietary
   formats.

   While

   At the time of writing this document, several features missing features in
   vCard were brought to the attention of the authors, authors such as social
   media contacts, gender pronouns pronouns, and others.  This highlights how
   vCard is not perceived as an evolving format and consequently and, consequently,
   hasn't been updated since close to for about ten years.  JSContact addresses these
   unmet demands and defines new vCard properties and parameters to
   allow interchanging them in both formats.

   The xCard [RFC6351] and jCard [RFC7095] specifications define
   alternative representations for vCard data, data in XML and JSON format formats,
   respectively.  Both explicitly aim to not change the underlying data
   model.  Accordingly, they are regarded as equal to vCard in the
   context of this document.

1.2.  Notational Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   The ABNF definitions in this document use the notations of [RFC5234].
   ABNF rules not defined in this document either are defined in either
   [RFC5234] (such as the ABNF for CRLF, WSP, DQUOTE, VCHAR, ALPHA, and
   DIGIT) or [RFC6350].

1.3.  Data Type Notations

   This section introduces the notations and terminology used to define
   data types in JSContact.

   The underlying format for JSContact is JSON and JSON, so also its data types also
   build on JSON values.  The terms "object" and "array" as well as the
   four primitive types ("strings", "numbers", "booleans", and "null")
   are to be interpreted as described in Section 1 of [RFC8259].  All
   JSContact data MUST be valid according to the constraints given in
   I-JSON [RFC7493].  Unless otherwise noted, all member names in JSON
   objects and all string values are case-sensitive.  Within the context
   of JSON objects, the term "key" is synonymous with "member name" as
   defined in Section 1 of [RFC8259].

1.3.1.  Objects and Properties

   JSContact defines data types for contact information such as
   addresses or names.  This information typically consists of multiple
   related elements, elements; for example example, a personal name and surname together
   form a name.  These related elements are organized in JSContact
   objects.  A JSContact object is a JSON object which: that has the following:

   1.  Has a  A unique type name registered in the IANA JSContact Types
       Registry "JSContact Types"
       registry (Section 3.6).

   2.  Has one  One or more object members for which the name and allowed value
       types are specified.  Such members are called "properties".

   3.  Has one  One property named @type with a string value that matches the
       type name of this the JSContact object.  In general, this property
       does not need to be set explicitly as outlined in Section 1.3.4.

   The following sections specify how to define JSContact object types.
   Section
   Sections 1.7 and Section 1.8 then define the exact requirements for property
   names.

   The next paragraph illustrates how a JSContact object is defined:

   | defined.

   A Foo object has the following properties:
   |
   |  *

   qux:  Number (mandatory).  Defines the qux-ishness of this
   | contact.
      The value MUST be an integer greater than 0 and less
   | than 10.

   Here, a JSContact object type named Foo is defined.  In addition to
   its @type property property, it has a property named qux for which values MUST
   be valid according to the definition of the Number type.  The
   property has one attribute, mandatory, which specifies that the
   property MUST be present for an instance of this JSContact object to
   be valid.  Finally, a free-text description describes the semantics
   and further restrictions.

1.3.2.  Type Signatures

   Type signatures are given for all JSON values and JSContact
   definitions in this document.  The following conventions are used:

   *  String -

   String:  The JSON string type.

   *  Number -

   Number:  The JSON number type.

   *  Boolean -

   Boolean:  The JSON boolean type.

   *  A[B] -

   A[B]:  A JSON object where the all keys are all of the type A, A and the all values are all
      of the type B.

   *  A[] -

   A[]:  A JSON array of values of type A.

   *  A|B -

   A|B:  The value is either of type A or of type B.

   *  * - *:  The type is undefined (the value could be any type, although
      permitted values may be constrained by the context of this value).

   Section 1.4 defines common data types, including signed or unsigned
   integers and dates.

1.3.3.  Property Attributes

   Object properties may also have a set of attributes defined along
   with the type signature.  These have the following meanings:

   *

   mandatory:  The property MUST be set for an instance of this object
      to be valid.

   *

   optional:  The property can can, but not need not, be set for an instance of
      this object to be valid.

   *

   default:  This is followed by a JSON value.  That value will be used
      for this property if it is omitted.

   *

   defaultType:  This is followed by the name of a JSContact object
      type.  A property value of JSContact object type is expected to be
      of this named type, in case it omits the @type property.

1.3.4.  The @type Property

   This property is defined as:

   *

   @type:  String.  Specifies the type of this the object.  This  It MUST match the
      type name of the JSContact object of which this the JSON object is an
      instance of.

   The purpose of this the @type property is to help implementations identify
   which JSContact object type a given JSON object represents.
   Implementations MUST validate that JSON objects with this property
   conform to the specification of the JSContact object type of that
   name.

   In many cases cases, the @type property value is implied by where its
   object occurs in JSContact data.  Assuming that both A and B are
   JSContact object types:

   *  An object that is set as the value for a property with type
      signature A MAY have the @type property set.  If the @type
      property is not set set, then its value is implied to be A by the
      property definition.

   *  An object that is set as the value for a property with type
      signature A|B (defaultType: A) MAY have the @type property set if
      it is an instance of A.  It MUST have the @type property set if it
      is an instance of B.  If instead  If, instead, the defaultType attribute is
      not
      defined defined, then the @type property MUST also be set for A.

   *  An object that is not the value of a property, such as the root of
      JSON data (directly or as a member of an array), MUST have the
      @type property set.

1.4.  Common Data Types

   In addition to the standard JSON data types, a couple of additional
   data types are common to the definitions of JSContact objects and
   properties.

1.4.1.  Id

   Where Id is given as a data type, it means a String of at least 1 and
   a maximum of 255 octets in size, and it MUST only contain characters
   from the URL and Filename Safe base64url alphabet, as defined in
   Section 5 of [RFC4648], excluding the pad character (=).  This means
   the allowed characters are the ASCII alphanumeric characters (A-Za-
   z0-9), hyphen (-), and underscore (_).

   In many places in JSContact JSContact, a JSON map is used where the map keys
   are of type Id and the map values are all the same type of object.
   This construction represents an unordered set of objects, with the
   added advantage that each entry has a name (the corresponding map
   key).  This allows for more concise patching of objects, objects and, when
   applicable, for the objects in question to be referenced from other
   objects within the JSContact object.  The map keys MUST be preserved
   across multiple versions of the JSContact object.

   Unless otherwise specified for a particular property, there are no
   uniqueness constraints on an Id value (other than, of course, the
   requirement that you cannot have two values with the same key within
   a single JSON map).  For example, two Card (Section 2) objects might
   use the same Ids in their respective photos properties.  Or within
   the same Card Card, the same Id could appear in the emails and phones
   properties.  These situations do not imply any semantic connections
   among the objects.

1.4.2.  Int and UnsignedInt

   Where Int is given as a data type, it means an integer in the range
   -2^53+1 <= value <= 2^53-1, which is the safe range for integers
   stored in a floating-point double, represented as a JSON Number.

   Where UnsignedInt is given as a data type, it means an integer in the
   range 0 <= value <= 2^53-1, 2^53-1 represented as a JSON Number.

1.4.3.  PatchObject

   A PatchObject is of type String[*], String[*] and represents an unordered set of
   patches on a JSON object.  Each key is a path represented in a subset
   of the JSON pointer Pointer format [RFC6901].  The paths have an implicit
   leading /, so each key is prefixed with / before applying the JSON
   pointer
   Pointer evaluation algorithm.

   A patch within a PatchObject is only valid if all the following
   conditions apply:

   1.  The pointer MAY reference inside an array array, but if the last
       reference token in the pointer is an array index, then the patch
       value MUST NOT be null.  The pointer MUST NOT use "-" as an array
       index in any of its reference tokens (i.e., you MUST NOT insert/
       delete from an array, but you MAY replace the contents of its
       existing members.  To add or remove members, one needs to replace
       the complete array value).

   2.  All reference tokens prior to the last (i.e., the value after the
       final slash) MUST already exist as values in the object being
       patched.  If the last reference token is an array index, then a
       member at this index MUST already exist in the referenced array.

   3.  There MUST NOT be two patches in the PatchObject where the
       pointer of one is the prefix of the pointer of the other, e.g.,
       addresses/1/city and addresses.

   4.  The value for the patch MUST be valid for the property being set
       (of the correct type and obeying any other applicable
       restrictions), or if null null, the property MUST be optional.

   The value associated with each pointer determines how to apply that
   patch:

   *  If null, remove the property from the patched object.  If the key
      is not present in the parent, this is a no-op.

   *  If non-null, set the value given as the value for this property
      (this may be a replacement or addition to the object being
      patched).

   A PatchObject does not define its own @type (Section 1.3.4) property.
   Instead, a an @type property in a patch MUST be handled as any other
   patched property value.

   Implementations MUST reject a PatchObject in its entirety a PatchObject if any of
   its patches are invalid.  Implementations MUST NOT apply partial
   patches.

1.4.4.  Resource

   This

   The Resource data type defines a resource associated with the entity
   represented by this the Card, identified by a URI [RFC3986].  Several
   property definitions later  Later in
   this document document, several property definitions refer to the Resource
   data type as the basis for their property-specific value types.  The
   Resource data type defines the properties that are common to all of
   them.  Property definitions making use of Resource MAY define
   additional properties for their value types.

   The @type property value MUST NOT be Resource, instead Resource; instead, it MUST be
   the name of a concrete resource type (see Section 2.6).  A Resource
   object has the following properties.

   *

   @type:  String.  Specifies the type of this resource object.  The
      allowed value is defined in later sections of this document for
      each concrete resource type (Section 2.6).

   *

   kind:  String (optional).  The kind of the resource.  The allowed
      values are defined in the property definition that makes use of
      the Resource type.  Some property definitions may change this
      property from being optional to mandatory.

   *

   uri:  String (mandatory).  The resource value.  This MUST be a _URI_
      as defined in Section 3 of [RFC3986].

   *

   mediaType:  String (optional).  Used for URI resource values.
      Provides the media type [RFC2046] of the resource identified by
      the URI.

   *

   contexts:  String[Boolean] (optional).  The contexts in which to use
      this resource.  Also see Section 1.5.1.

   *

   pref:  UnsignedInt (optional).  The preference of this the resource in
      relation to other resources.  Also see Section 1.5.4.

   *

   label:  String (optional).  A custom label for the value, value.  Also see
      Section 1.5.3.

1.4.5.  UTCDateTime

   This

   UTCDateTime is a string in [RFC3339] date-time format, format [RFC3339], with the further
   restrictions that any letters MUST be in uppercase, uppercase and the time
   offset MUST be the character Z.  Fractional second values MUST NOT be
   included unless non-zero they are non-zero, and they MUST NOT have trailing zeros,
   zeros to ensure there is only a single representation for each date-time. date-
   time.

   For example, 2010-10-10T10:10:10.003Z is conformant, but
   2010-10-10T10:10:10.000Z is invalid and invalid; the correct encoding is correctly encoded as
   2010-10-10T10:10:10Z.

1.5.  Common Properties

   Most of the properties in this document are specific to a single
   JSContact object type.  Such properties are defined along with the
   respective object type.  The properties in this section are common to
   multiple data types and are defined here to avoid repetition.  Note
   that these properties MUST only be set for a JSContact object if they
   are explicitly mentioned to be allowed as allowable for this object type.

1.5.1.  contexts

   Type: String[Boolean]

   This property associates contact information with one or more
   contexts in which it should be used.  For example, someone might have
   distinct phone numbers for work and private contexts, contexts and may set the
   desired context on the respective phone number in the phones
   (Section 2.3.3) property.

   This section defines common contexts.  Additional contexts may be
   defined in the properties or data types that make use of this
   property.  The enumerated (Section 1.7.4) common context values are:

   *  private: the contact information that may be used in a private
      context.

   *  work: the contact information that may be used in a professional
      context.

1.5.2.  extra

   This

   extra is a reserved property name.  Implementations MUST NOT set this
   property in a JSContact object.  Any JSContact object including a
   property with this name MUST be considered invalid.

   The purpose of this reserved property name is to provide implementors
   with a name which that is certain to never occur as a property name in a
   JSContact object.  Implementations might want to map unknown or
   vendor-specific properties to a variable with this name, but this is
   implementation-specific.

1.5.3.  label

   Type: String

   This property allows associating contact data with user-defined
   labels.  Such labels may be set for phone numbers, email addresses addresses,
   and resources.  Typically, these labels are displayed along with
   their associated contact data in graphical user interfaces.  Such  Note
   that succinct labels are best be succinct to properly for proper display on small graphical
   interfaces and screens.

1.5.4.  pref

   Type: UnsignedInt

   This property allows defining a preference order for contact
   information.  For example, a person may have two email addresses and
   prefer to be contacted with one of them.

   Its value MUST be in the range of 1 and to 100.  Lower values correspond
   to a higher level of preference, with 1 being most preferred.  If no
   preference is set, then the contact information MUST be interpreted
   as being least preferred.

   Note that the preference only is only defined in relation to contact
   information of the same type.  For example, the preference orders
   within emails and phone numbers are independent of each other.

1.5.5.  phonetic

   This

   The phonetic property defines how to pronounce a value in the
   language indicated in the Card language (Section 2.1.5) property or
   the language tag of its localizations (Section 2.7.1).  Exemplary
   uses of this property are to define defining how to pronounce Japanese names, or for romanization of names
   and romanizing Mandarin or Cantonese name and address components.
   The properties are defined as follows:

   *

   phonetic:  String.  Contains the phonetic representation of a value.
      Any script language subtag in the Card language (Section 2.1.5)
      property MUST be ignored for use with the phonetic property.  If
      this property is set, then at least one of the phoneticScript or
      phoneticSystem properties that relate to this value MUST be set.

   *

   phoneticScript:  String.  The script used in the value of the related
      phonetic property.  This MUST be a valid script subtag as defined
      in Section 2.2.3 of [RFC5646].

   *

   phoneticSystem:  String.  The phonetic system used in the related
      value of the phonetic property.  The enumerated values (Section 1.7.4)
      values are:

      -

      *  ipa: denotes the International Phonetic Alphabet [IPA].

      -

      *  jyut: denotes the Cantonese romanization system "Jyutping".

      -

      *  piny: denotes the Standard Mandarin romanization system "Hanyu
         Pinyin".

   The relation between the phoneticSystem, phoneticScript phoneticScript, and phonetic
   properties is type-specific.  This specification defines this
   relation in the Name (Section 2.2.1) and Address (Section 2.5.1)
   object types, respectively.

   The following example illustrates the phonetic property for a name
   (Section 2.2.1):

   "name": {
     "components": [{
       "kind": "given",
       "value": "John",
       "phonetic": "/ˈdʒɑːn/"
     }, {
       "kind": "surname",
       "value": "Smith",
       "phonetic": "/smɪθ/"
     }],
     "phoneticSystem": "ipa"
   }

   Figure 1: Example of a phonetic Property for the name Name "John Smith" as
                           pronounced
                           Pronounced in the USA. USA

1.6.  Internationalization

   JSContact aims to be used for international contacts and addressbook address book
   data.  Notably  Notably, text values such as names and addresses are likely to
   cover a wide range of languages and cultures.  This section describes
   internationalization for free-form text values, values as well as for Uniform
   Resource Identifiers (URIs).

1.6.1.  Free-form text  Free-Form Text

   Properties having free-form text values MAY contain any valid
   sequence of Unicode characters encoded as a JSON string.  Such values
   can contain unidirectional left-to-right and right-to-left text, as
   well as bidirectional text using Unicode Directional Formatting
   Characters as described in Section 2 of [UBiDi].  Implementations
   setting bidirectional text MUST make sure that each property value
   complies with the requirements of the Unicode Bidirectional
   Algorithm.  Implementations MUST NOT assume that text values of
   adjacent properties are processed or displayed as a combined string, string;
   for example example, the values of a given name component and a surname
   component may or may not to be rendered together.

1.6.2.  URIs

   Several properties require their string value to be a URI as defined
   in [RFC3986].  Implementations MUST make sure to use proper percent-
   encoding for URIs that can not cannot be represented using unreserved URI
   characters.  Section 3.1 of [RFC3987] defines how to convert
   Internationalized Resource Identifiers to URIs.  JSContact makes no
   recommendation on how to display URIs, but section "4.8.3
   Internationalization the WHATWG URL Living
   Standard (see "Internationalization and special characters"
   (Section 4.8.3) of the W3C URL Standard
   [W3C-URL] [WHATWG-URL]) provides guidance for URLs found in
   the context of a web browser.

1.7.  Validating JSContact

   This specification distinguishes between three kinds of properties
   regarding validation: IANA-registered properties and unknown
   properties
   properties, which are defined in this section, while and vendor-specific
   properties
   properties, which are defined in Section 1.8.1.  A JSContact object
   is invalid if any of its properties are invalid.

   This document defines for whether each property if it is mandatory or optional.
   A mandatory property MUST be present for a JSContact object to be
   valid.  An optional property does not need to be present.  The values
   of both required and optional properties MUST adhere to the data type
   and definition of that property.

1.7.1.  Case-Sensitivity

   All property names, object type names names, and enumerated values are case-
   sensitive, if not
   case-sensitive, unless explicitly stated otherwise in their according
   definition.
   definitions.  Implementations MUST handle a JSContact object as
   invalid if a type name, property name name, or enumerated value only
   differs in case from one defined for any JSContact version known to
   that implementation.  This applies regardless of what JSContact
   version the Card object defines in its version (Section 2.1.2)
   property.  Section 1.7.3 defines how to handle unknown properties.

1.7.2.  IANA-registered  IANA-Registered Properties

   An IANA-registered property is any property that has been registered
   according to the IANA property registry rules as outlined in
   Section 3.  All properties defined in this specification, including
   their object value types and enumerated values, are registered at
   IANA.

   Implementations MUST validate IANA-registered properties in JSContact
   data, unless they are unknown to the implementation (see
   Section (Section 1.7.3).
   They MUST reject invalid IANA-registered properties.  A property is
   invalid if its name matches the name of an IANA-
   registered IANA-registered property
   but the value violates its definition according to the JSContact
   specification version defined in the Card version
   property (Section 2.1.2). 2.1.2)
   property.

   IANA-registered property names MUST NOT contain US-ASCII control
   characters (U+0000 to U+001F, U+007F), the COLON (U+003A) (U+003A), or the
   QUOTATION MARK (U+0022) characters. (U+0022).  They MUST only contain US-ASCII
   alphanumeric characters that match the ALPHA and DIGIT rules defined
   in Appendix B.1 of [RFC5234]) [RFC5234] or the COMMERCIAL AT (U+0040) character.
   IANA-registered property names MUST be notated in lower camel case.

1.7.3.  Unknown Properties

   Implementations may encounter JSContact data where a property name is
   unknown to that implementation, implementation but the name adheres to the syntactic
   restrictions of IANA-registered property names.  Implementations MUST
   make sure that such a name does not violate the case-sensitivity
   rules defined in Section 1.7.1.  If the property name is valid, then
   implementations MUST NOT treat such properties as invalid.  Instead,
   they MUST preserve them in the JSContact object.

   Implementations that create or update JSContact data MUST only set
   IANA-registered properties or vendor-specific properties.  Preserving
   properties that are unknown to the implementation, implementation is to allow
   applications and services to interoperate without data loss, even if
   not all of them implement the same set of JSContact extensions.

1.7.4.  Enumerated Values

   Several properties in this document restrict their allowed values to
   be from
   a list of String values.  These values are case-sensitive.  If not
   noted otherwise for a specific property, the initial list of values
   for such properties is registered at IANA in the JSContact "JSContact Enum Values Registry
   Values" registry (Section 3.7).  Implementations MUST only set
   IANA-registered IANA-
   registered or vendor-specific (Section 1.8.2) values for such
   properties.

1.8.  Vendor-Specific Extensions

   Vendors may extend properties and values for experimentation or to
   store contacts data that only is only useful for a single service or
   application.  Such extensions are not meant for interoperation.  If
   instead  If,
   instead, interoperation is desired, vendors are strongly encouraged
   to define and register new properties, types types, and values at IANA. IANA as
   defined in Section 3 defines how to register new properties, types or values at
   IANA. 3.  Section 1.7.2 defines the naming conventions
   for IANA-
   registered IANA-registered elements.

1.8.1.  Vendor-specific  Vendor-Specific Properties

   Vendor-specific property names MUST start with a vendor-specific
   prefix followed by a name, as produced by the v-extension ABNF below.
   The prefix and name together form the property name.  The vendor-
   specific prefix MUST be a domain name under control of the service or
   application that sets the property, but it need not resolve in the
   Domain Name System [RFC1034] and [RFC1035].  The prefix ietf.org and its
   subdomain names are reserved for IETF specifications.  The name MUST
   NOT contain the TILDE (U+007E) and SOLIDUS (U+002F) characters, as
   these require special-escaping special escaping when encoding a JSON Pointer [RFC6901]
   for that property.

   Vendor-specific properties MAY be set in any JSContact object.
   Implementations MUST preserve vendor-specific properties in JSContact
   data, irrespective if they know their use.  They MUST NOT reject the
   property value as invalid, unless they are in control of the vendor-
   specific property as outlined in the above paragraph.

   The ABNF rule v-extension formally defines valid vendor-specific
   property names.  Note that the vendor prefix allows for more values
   than are allowed as Internationalized Domain Names (IDN) [RFC8499].
   This is to allow (IDNs) [RFC8499]; therefore,
   JSContact implementations can simply validate property names without
   implementing the full set of rules that apply to domain names.

   v-extension = v-prefix ":" v-name

   v-prefix = v-label *("." v-label)

   v-label = alnum-int / alnum-int *(alnum-int / "-") alnum-int

   alnum-int = ALPHA / DIGIT / NON-ASCII
     ; see RFC 6350 6350, Section 3.3

   v-name = 1*(WSP / "!" / %x23-2e / %x30-7d / NON-ASCII)
     ; any characters except CTLs, DQUOTE, SOLIDUS SOLIDUS, and TILDE

          Figure 2: ABNF rules Rules for vendor-specific property names Vendor-Specific Property Names

   The value of vendor-specific properties can be any valid JSON value,
   and naming restrictions do not apply to such values.  Specifically,
   if the property value is a JSON object object, then the keys of such objects
   need not be named as vendor-specific properties.  The example properties, as illustrated in
   Figure 3 illustrates this: 3:

   "example.com:foo": "bar",
   "example.com:foo2": {
     "bar": "baz"
   }

              Figure 3: Examples of vendor-specific properties Vendor-Specific Properties

1.8.2.  Vendor-specific  Vendor-Specific Values

   Some JSContact IANA-registered properties allow their values to be
   vendor-specific.  One such example is the kind property
   Section 2.1.4, (Section 2.1.4)
   property, which enumerates its standard values but also allows for
   arbitrary vendor-specific values.  Such vendor-specific values MUST
   be valid v-extension values as defined in Section 1.8.1.  The example
   in Figure 4 illustrates this:

   "kind": "example.com:baz"

                Figure 4: Example of a vendor-specific value Vendor-Specific Value

   Vendors are strongly encouraged to specify a new standard value once
   a vendor-specific one turns out to also be useful also for other systems.

1.9.  Versioning

   Every instance of a JSContact Card (Section 2) indicates which
   JSContact version its IANA-registered properties and values are based
   on.  The version is indicated both in the version (Section 2.1.2)
   property within the Card and in the version (Section 3.1) parameter
   of the JSContact MIME content type.  All IANA-registered elements
   indicate the version at which they got were introduced or obsoleted.

1.9.1.  Version Format and Requirements

   A JSContact version consists of a numeric major and minor version,
   separated by the FULL STOP character (U+002E).  Later versions are
   numerically higher than former versions, with the major version being
   more significant than the minor version.  A version value is produced
   by the ABNF following ABNF:

   jsversion = 1*DIGIT "." 1*DIGIT

                                  Figure 5

   Differing major version values indicate substantial differences in
   JSContact semantics and format.  Implementations MUST be prepared
   that for
   property definitions and other JSContact elements that differ in a
   backwards-incompatible manner.

   Differing minor version values indicate additions that enrich
   JSContact data, data but do not introduce backwards-incompatible changes.
   Typically, these are new property enum values or properties with a
   narrow semantic scope.  A new minor version MUST NOT require
   implementations to change their processing of JSContact data.
   Changing the major version number resets the minor version number to
   zero.

1.9.2.  Current Version

   This specification registers JSContact version value 1.0 (Table 1).

2.  Card

   This section defines the JSContact object type Card.  A Card stores
   contact information, typically that of a person, organization organization, or
   company.

   Its media type is defined in Section 3.1.

   Figure 5 6 shows a basic Card for the person "John Doe".  As the object
   is the topmost object in the JSON data data, it has the @type property set
   according to the rules defined in Section 1.3.4.

   {
     "@type": "Card",
     "version": "1.0",
     "uid": "22B2C7DF-9120-4969-8460-05956FE6B065",
     "kind": "individual",
     "name": {
       "components": [
         { "kind": "given", "value": "John" },
         { "kind": "surname", "value": "Doe" }
       ],
       "isOrdered": true
     }
   }

                     Figure 5: 6: Example of a basic Basic Card

2.1.  Metadata Properties

   This section defines properties about this instance of a Card, Card such as
   its unique identifier, its creation date, and how it relates to other
   Cards and other metadata information.

2.1.1.  @type

   Type: String (mandatory). (mandatory)

   This MUST be Card, if set.

2.1.2.  version

   Type: String (mandatory).

   Specifies (mandatory)

   This specifies the JSContact version used to define this the Card.  The
   value MUST be one of the IANA-registered JSContact Enum Values for
   the version property.  Also see Section 1.9.2.

   "version": "1.0"

                         Figure 6: 7: version example Example

2.1.3.  created

   Type: UTCDateTime (optional). (optional)

   The date and time when this the Card was created.

   "created": "2022-09-30T14:35:10Z"

                         Figure 7: 8: created example Example

2.1.4.  kind

   Type: String (optional, (optional; default: individual). individual)

   The kind of the entity the Card represents.

   The enumerated (Section 1.7.4) values are:

   *  individual: a single person

   *  group: a group person of persons people or entities

   *  org: an organization

   *  location: a named location

   *  device: a device, device such as appliances, computers, an appliance, a computer, or a network
      elements
      element

   *  application: a software application

   "kind": "individual"

                           Figure 8: 9: kind example Example

2.1.5.  language

   Type: String (optional). (optional)

   This is the language tag, as defined in [RFC5646], that best
   describes the language used for text in the Card, optionally
   including additional information such as the script.  Note that
   values MAY be localized in the localizations property Section 2.7.1. (Section 2.7.1)
   property.

   "language": "de-AT"

                        Figure 9: 10: language example Example

2.1.6.  members

   Type: String[Boolean] (optional). (optional)

   This identifies the set of Cards that are members of this group Card.
   Each key in the set is the uid property value of the member, and each
   boolean value MUST be true.  If this property is set, then the value
   of the kind property MUST be group.

   The opposite is not true.  A group Card will usually contain the
   members property to specify the members of the group, but it is not
   required to.  A group Card without the members property can be
   considered an abstract grouping, grouping or one whose members are known
   empirically (e.g., "IETF Participants").

   "kind": "group",
   "name": {
     "full": "The Doe family"
   },
   "uid": "urn:uuid:ab4310aa-fa43-11e9-8f0b-362b9e155667",
   "members": {
     "urn:uuid:03a0e51f-d1aa-4385-8a53-e29025acd8af": true,
     "urn:uuid:b8767877-b4a1-4c70-9acc-505d3819e519": true
   }

                         Figure 10: 11: members example Example

2.1.7.  prodId

   Type: String (optional). (optional)

   The identifier for the product that created the Card.  If set, the
   value MUST be at least one character long.

   "prodId": "ACME Contacts App version 1.23.5"

                         Figure 11: 12: prodId example Example

2.1.8.  relatedTo

   Type: String[Relation] (optional).

   Relates (optional)

   This relates the object to other Cards.  This  It is represented as a map,
   where each key is the uid of the related Card Card, and the value defines
   the relation.  The Relation object has the following properties:

   *

   @type:  String.  This MUST be Relation, if set.

   *

   relation:  String[Boolean] (optional, (optional; default: empty Object) Object).
      Describes how the linked object is related to the linking object.
      The relation is defined as a set of relation types.  The key in
      the set defines the relation type, type; the value for each key in the
      set MUST be true.  The relationship between the two objects is
      undefined if the set is empty.

      The initial list of enumerated (Section 1.7.4) relation types
      matches the IANA-registered TYPE [IANA-vCard] parameter [IANAvCard] values of
      the vCard RELATED property (Section 6.6.6 of [RFC6350]):

      -

      *  acquaintance

      -

      *  agent

      -

      *  child

      -  colleague

      -  contact

      -

      *  co-resident

      -

      *  co-worker

      -

      *  colleague

      *  contact

      *  crush

      -

      *  date

      -

      *  emergency

      -

      *  friend

      -

      *  kin

      -

      *  me

      -

      *  met

      -

      *  muse

      -

      *  neighbor

      -

      *  parent

      -

      *  sibling

      -

      *  spouse

      -

      *  sweetheart

   "relatedTo": {
     "urn:uuid:f81d4fae-7dec-11d0-a765-00a0c91e6bf6": {
       "relation": {
         "friend": true
       }
     },
     "8cacdfb7d1ffdb59@example.com": {
       "relation": {}
     }
   }

                        Figure 12: 13: relatedTo example Example

2.1.9.  uid

   Type: String (mandatory). (mandatory)

   An identifier, identifier that is used to associate the object as the same across
   different systems, address books books, and views.  The value SHOULD be a
   URN [RFC8141] [RFC8141], but for compatibility with [RFC6350] [RFC6350], it MAY also be a
   URI [RFC3986] or free-text value.  The value of the URN SHOULD be in
   the uuid namespace [RFC4122].  As of this writing, a revision
   [I-D.ietf-uuidrev-rfc4122bis] [UUID]
   of the UUID standard Universally Unique Identifier (UUID) Standards Track document
   [RFC4122] is being
   worked on in progress and is will likely to introduce new UUID versions
   and best practices to generate global unique identifiers.
   Implementors SHOULD follow any recommendations described there.
   Until then, implementations SHOULD generate identifiers using the
   random or
   pseudo-random pseudorandom UUID version described in Section 4.4 of
   [RFC4122].

   "uid": "urn:uuid:f81d4fae-7dec-11d0-a765-00a0c91e6bf6"

                           Figure 13: 14: uid example Example

2.1.10.  updated

   Type: UTCDateTime (optional). (optional)

   The date and time when the data in this the Card was last modified.

   "updated": "2021-10-31T22:27:10Z"

                         Figure 14: 15: updated example Example

2.2.  Name and Organization Properties

   This section defines properties that name the entity represented by
   this Card,
   the Card and its related organizations and roles, as well as roles.  It also describes
   how to refer to the entity represented by this the Card in spoken or
   written language.

2.2.1.  name

   Type: Name (optional). (optional)

   The name of the entity represented by this the Card.  This can be any type
   of name, e.g., it can can, but need not not, be the legal name of a person.

2.2.1.1.  Name object Object

   A Name object has the following properties

   * properties:

   @type:  String.  This MUST be Name, if set.

   *

   components:  NameComponent[] (optional).  The components
      (Section 2.2.1.2) making up this name.  This property MUST be set
      if the full property is not set, otherwise set; otherwise, it SHOULD be set.  The
      component list MUST have at least one entry having a different
      kind than separator.

      Name components SHOULD be ordered such that when their values are
      joined as a String produce String, a valid full name of this entity. the entity is produced.
      If so, implementations MUST set the isOrdered property value to
      true.

      If the name components are ordered, then the defaultSeparator
      property and name components of kind separator give guidance on
      what characters to insert between components, but implementations
      are free to choose any others.  In lack of  When lacking a separator,
      inserting a single Space space character in between the name component
      values is a good choice.

      If instead

      If, instead, the name components follow no particular order, then
      the isOrdered property value MUST be false, the components
      property MUST NOT contain a NameComponent of kind separator separator, and
      the defaultSeparator property MUST NOT be set.

      Figure 15 is 16 shows an example for the name "Vincent van Gogh".  Note
      how a single name component value may consist of multiple words.
      Figure 16 illustrates a name with a second surname, such as a
      Spanish name.  Additional examples are shown in Figure 18 and
      Figure 38.

      "name": {
        "components": [
          { "kind": "given", "value": "Vincent" },
          { "kind": "surname", "value": "van Gogh" }
        ],
        "isOrdered": true
      }

                Figure 15: 16: Example for of a surname Surname with two words Two Words

      Figure 17 illustrates a name with a second surname such as a
      Spanish name.  Additional examples are shown in Figures 19 and 39.

      "name": {
        "components": [
          { "kind": "given", "value": "Diego" },
          { "kind": "surname", "value": "Rivera" },
          { "kind": "surname2", "value": "Barrientos" }
        ],
        "isOrdered": true
      }

                    Figure 16: 17: Example for of a second surname

   * Second Surname

   isOrdered:  Boolean (optional, (optional; default: false).  This indicates  Indicates if the
      name component sequence in the components property is ordered.

   *

   defaultSeparator:  String (optional).  The default separator to
      insert between name component values when concatenating all name
      component values to a single String.  Also see the definition of
      the separator kind for the NameComponent (Section 2.2.1.2) object.
      This property MUST NOT be set if the Name isOrdered property value
      is false or if the components property is not set.

   *

   full:  String (optional).  This is the  The full name representation of
      this the Name.
      This property MUST be set if the components property is not set.

      "full": "Mr. John Q. Public, Esq."

                           Figure 17: 18: full example

   * Example

   sortAs:  String[String] (optional).

      This defines  Defines how this the name
      lexicographically sorts in relation to other names when compared
      by a name component type.  The key in the map defines the name
      component type.  The value for that key defines the verbatim
      string to compare when sorting by this the name component type.
      Absence of a key indicates that this the name component type SHOULD NOT
      be considered during sort.  Sorting by that missing name component type
      type, or if the sortAs property is not
      set set, is implementation-specific. implementation-
      specific.  This property MUST NOT be set if the components
      property is not set.

      Each key in the map MUST be a valid name component type value as
      defined for the kind property of the NameComponent object (see
      below).  For each key in the map map, there MUST exist at least one
      NameComponent object having that has the type in the components property
      of this the name.

      Figure 18 19 illustrates the use of sortAs.  The property value
      indicates that the middle name followed by both surnames should be
      used when sorting this the name by surname.  The absence of the middle
      indicates that the middle name on its own should be disregarded
      during sort.  Even though the name only contains one name
      component for the given name, the sortAs property still explicitly
      defines how to sort by the given name as otherwise name; otherwise, sorting by it
      would be undefined.

   *

   phoneticScript:  String (optional).  The script used in the value of
      the NameComponent phonetic property.  Also see Section 1.5.5.  See Section 1.5.5 for more
      information and Figure 19 20 for an example.

   *

   phoneticSystem:  String (optional).  The phonetic system used in the
      NameComponent phonetic property.  Also see Section 1.5.5.  See Section 1.5.5 for more
      information and Figure 19 20 for an example.

   "name": {
     "components": [
       { "kind": "given", "value": "Robert" },
       { "kind": "given2", "value": "Pau" },
       { "kind": "surname", "value": "Shou Chang" }
     ],
     "sortAs": {
       "surname": "Pau Shou Chang",
       "given": "Robert"
     },
     "isOrdered": true
   }

                         Figure 18: Example for 19: sortAs Example

   {
     "@type": "Card",
     "language": "zh-Hant",
     "name": {
       "components": [
         { "kind": "surname", "value": "孫" },
         { "kind": "given", "value": "中山" },
         { "kind": "given2", "value": "文" },
         { "kind": "given2", "value": "逸仙" }
       ]
     },
     "localizations": {
       "yue": {
         "name/phoneticSystem": "jyut",
         "name/phoneticScript": "Latn",
         "name/components/0/phonetic": "syun1",
         "name/components/1/phonetic": "zung1saan1",
         "name/components/2/phonetic": "man4",
         "name/components/3/phonetic": "jat6sin1"
       }
     }
   }

               Figure 19: Example for 20: phonetic and localizations Example

2.2.1.2.  NameComponent

   A NameComponent object has the following properties:

   *

   @type:  String.  This MUST be NameComponent, if set.

   *

   value:  String (mandatory).  The value of this the name component.  This
      can be composed of one or multiple words, words such as "Poe" or "van
      Gogh".

   *

   kind:  String (mandatory).  The kind of this the name component.  The
      enumerated (Section 1.7.4) values are:

      -

      *  title: an honorific title or prefix, e.g., "Mr", "Ms", "Dr".

      - "Mr.", "Ms.", or
         "Dr.".

      *  given: a given name, also known as "first name", name" or "personal
         name".

      -

      *  given2: a name that appears between the given and surname, surname such
         as a middle name or patronymic name.

      -

      *  surname: a surname, also known as "last name", name" or "family name".

      -

      *  surname2: a secondary surname (used in some cultures), also
         known as "maternal surname".

      -

      *  credential: a credential, also known as "accreditation
         qualifier" or "honorific suffix", e.g., "B.A.", "Esq.".

      -

      *  generation: a generation marker or qualifier, e.g., “Jr.” "Jr." or
         “III”.

      -
         "III".

      *  separator: a formatting separator between two ordered name non-
         separator components.  The value property of the component
         includes the verbatim separator, for example example, a hyphen
         character or even an empty string.  This value has higher
         precedence than the defaultSeparator property of the Name.
         Implementations MUST NOT insert two consecutive separator components, instead
         components; instead, they SHOULD insert a single separator
         component with the combined value.  This component kind MUST
         NOT be set if the Name isOrdered property value is false.

   *

   phonetic:  String (optional).  This defines  Defines how to pronounce this the name
      component.  If this property is set, then at least one of the Name
      object properties, phoneticSystem or phoneticScript properties phoneticScript, MUST be set.
      Also see Section 1.5.5.

2.2.1.3.  nicknames

   Type: Id[Nickname] (optional). (optional)

   The nicknames of the entity represented by this the Card.  A Nickname
   object has the following properties:

   *

   @type:  String.  This MUST be Nickname, if set.

   *

   name:  String (mandatory).  The nickname.

   *

   contexts:  String[Boolean] (optional) (optional).  The contexts in which to use
      this
      the nickname.  Also see Section 1.5.1.

   *

   pref:  UnsignedInt (optional).  The preference of this the nickname in
      relation to other nicknames.  Also see Section 1.5.4.

   "nicknames": {
     "k391": {
       "name": "Johnny"
     }
   }

                        Figure 20: 21: nicknames example Example

2.2.2.  organizations

   Type: Id[Organization] (optional). (optional)

   The companies company or organizations organization names and units associated with this the Card.
   An Organization object has the following properties, of which at
   least one of the name and units properties MUST be set:

   *

   @type:  String.  This MUST be Organization, if set.

   *

   name:  String (optional).  The name of this the organization.

   *

   units:  OrgUnit[] (optional).  A list of organizational units,
      ordered as descending by hierarchy (e.g., a geographic or
      functional division sorts before a department within that
      division).  If set, the list MUST contain at least one entry.

   *

   sortAs:  String (optional).  This defines  Defines how this the organization name
      lexicographically sorts in relation to other organizations when
      compared by the name.  The value defines the verbatim string value
      to compare.  In absence of this property, the name property value
      MAY be used for comparison.

   *

   contexts:  String[Boolean] (optional).  The contexts in which
      association with this the organization apply.  For example, membership
      in a choir may only apply in a private context.  Also see
      Section 1.5.1.

   A

   An OrgUnit object has the following properties:

   *

   @type:  String.  This MUST be OrgUnit, if set.

   *

   name:  String (mandatory).  The name of this the organizational unit.

   *

   sortAs:  String (optional).  This defines  Defines how this the organization unit name
      lexicographically sorts in relation to other organizational units
      of the same level when compared by the name.  The level is defined
      by the array index of this the organizational unit in the units
      property of the Organization object.  The property value defines
      the verbatim string value to compare.  In absence of this
      property, the name property value MAY be used for comparison.

   "organizations": {
     "o1": {
       "name": "ABC, Inc.",
       "units": [
         { "name": "North American Division" },
         { "name": "Marketing" }
       ],
       "sortAs": "ABC"
     }
   }

                      Figure 21: 22: organizations example Example

2.2.3.  speakToAs

   Type: SpeakToAs (optional). (optional)

   Provides information on how to address, speak to to, or refer to the
   entity that is represented by this the Card.  A SpeakToAs object has the
   following properties, of which at least one of the grammaticalGender
   and pronouns properties MUST be set:

   *

   @type:  String.  This MUST be SpeakToAs, if set.

   *

   grammaticalGender:  String (optional).  Defines which grammatical
      gender to use in salutations and other grammatical constructs.
      For example, the German language distinguishes by grammatical
      gender in salutations such as "Sehr geehrte" (feminine) and "Sehr
      geehrter" (masculine).  The enumerated (Section 1.7.4) values are:

      -

      *  animate

      -
      *  common

      -
      *  feminine

      -
      *  inanimate

      -
      *  masculine

      -
      *  neuter

      Note that the grammatical gender does not allow inferring the
      gender identities or assigned sex of the contact.

   *

   pronouns:  Id[Pronouns] (optional).  Defines the pronouns that the
      contact chooses to use for themselves.

   A Pronouns object has the following properties:

   *

   @type:  String.  This MUST be Pronouns, if set.

   *

   pronouns:  String (mandatory).  Defines the pronouns.  Any value or
      form is allowed.  Examples in English include she/her and
      they/them/theirs.  The value MAY be overridden in the
      localizations property (Section 2.7.1).

   * 2.7.1) property.

   contexts:  String[Boolean] (optional).  The contexts in which to use these
      the pronouns.  Also see Section 1.5.1.

   *

   pref:  UnsignedInt (optional).  The preference of these the pronouns in
      relation to other pronouns in the same context.  Also see
      Section 1.5.4.

   "speakToAs": {
     "grammaticalGender": "neuter",
     "pronouns": {
       "k19": {
         "pronouns": "they/them",
         "pref": 2
       },
       "k32": {
         "pronouns": "xe/xir",
         "pref": 1
       }
     }
   }

                        Figure 22: 23: speakToAs example Example

2.2.4.  titles

   Type :

   Type: Id[Title] (optional). (optional)

   The job titles or functional positions of the entity represented by
   this
   the Card.  A Title object has the following properties:

   *

   @type:  String.  This MUST be Title, if set.

   *

   name:  String (mandatory).  The title or role name of the entity
      represented by this the Card.

   *

   kind:  String (optional, default (optional; default: title).  Describes the
      organizational or situational kind of this the title.  Some
      organizations and individuals distinguish between _titles_ as
      organizational positions and _roles_ as more temporary
      assignments, assignments
      such as in project management.

      The enumerated (Section 1.7.4) values are:

      -

      *  title

      -  role
      *  role

   organizationId:  Id (optional).  The identifier of the organization
      in which this title is held.

   "titles": {
     "le9": {
       "kind": "title",
       "name": "Research Scientist"
     },
     "k2": {
       "kind": "role",
       "name": "Project Leader",
       "organizationId": "o2"
     }
   },
   "organizations": {
     "o2": {
       "name": "ABC, Inc."
     }
   }

                         Figure 23: 24: titles example Example

2.3.  Contact Properties

   This section defines properties how to properties contact the entity represented by this
   the Card.

2.3.1.  emails

   Type: Id[EmailAddress] (optional). (optional)

   The email addresses in which to contact the entity represented by this the
   Card.  An EmailAddress object has the following properties:

   *

   @type:  String.  This MUST be EmailAddress, if set.

   *

   address:  String (mandatory).  The email address.  This MUST be an
      _addr-spec_ value as defined in Section 3.4.1 of [RFC5322].

   *

   contexts:  String[Boolean] (optional).  The contexts in which to use
      this email address.  Also see Section 1.5.1.

   *

   pref:  UnsignedInt (optional).  The preference of this the email address
      in relation to other email addresses.  Also see Section 1.5.4.

   *

   label:  String (optional).  A custom label for the value, value.  Also see
      Section 1.5.3.

   "emails": {
     "e1": {
       "contexts": {
         "work": true
       },
       "address": "jqpublic@xyz.example.com"
     },
     "e2": {
       "address": "jane_doe@example.com",
       "pref": 1
     }
   }

                         Figure 24: 25: emails example Example

2.3.2.  onlineServices

   Type: Id[OnlineService] (optional). (optional)

   The online services that are associated with the entity represented
   by this the Card.  This can be messaging services, social media profiles,
   and other.  An OnlineService object has the following properties, of
   which at least the uri or user property MUST be set:

   *

   @type:  String.  This MUST be OnlineService, if set.

   *

   service:  String (optional).  The name of the online service or
      protocol.  The name MAY be capitalized the same as on the
      service's website, app app, or publishing material, but names MUST be
      considered equal is if they match case-insensitively.  Examples are
      GitHub, kakao, Kakao, and Mastodon.

   *

   uri:  String (optional).  This identifies  Identifies the entity represented by
      this card the
      Card at the online service.  This MUST be a _URI_ as defined in
      Section 3 of [RFC3986].

   *

   user:  String (optional).  This names  Names the entity represented by
      this the Card
      at the online service.  Any free-text value is allowed.  The
      service property SHOULD be set.

   *

   contexts:  String[Boolean] (optional).  The contexts in which to use this
      the service.  Also see Section 1.5.1.

   *

   pref:  UnsignedInt (optional).  The preference of this the service in
      relation to other services.  Also see Section 1.5.4.

   *

   label:  String (optional).  A custom label for the value, value.  Also see
      Section 1.5.3.

   "onlineServices": {
     "x1": {
       "uri": "xmpp:alice@example.com"
     },
     "x2": {
       "service": "Mastodon",
       "user": "@alice@example2.com",
       "uri": "https://example2.com/@alice"
     }
   }

                     Figure 25: 26: onlineServices example Example

2.3.3.  phones

   Type: Id[Phone] (optional). (optional)

   The phone numbers in which to contact the entity represented by this the
   Card.  A Phone object has the following properties:

   *

   @type:  String.  This MUST be Phone, if set.

   *

   number:  String (mandatory).  The phone number, number as either a URI or
      free-text.
      free text.  Typical URI schemes are the [RFC3966] tel [RFC3966] or [RFC3261] sip schemes,
      [RFC3261], but any URI scheme is allowed.

   *

   features:  String[Boolean] (optional).  The set of contact features
      that this the phone number may be used for.  The set is represented as
      an object, with each key being a method type.  The boolean value
      MUST be true.  The enumerated (Section 1.7.4) method type values
      are:

      -

      *  mobile: the number is for a mobile phone.

      -
      *  voice: the number is for calling by voice.

      -
      *  text: the number that supports text messages (SMS).

      -
      *  video: the number that supports video conferencing.

      -
      *  main-number: this number is the main phone number, number such as the number of the front-desk
         front desk at a company, as opposed to a direct-
         dial direct-dial number of
         an individual employee.

      -
      *  textphone: the number is for a device for people with hearing
         or speech difficulties.

      -
      *  fax: the number is for sending faxes.

      -
      *  pager: the number is for a pager or beeper.

   *

   contexts:  String[Boolean] (optional).  The contexts in which to use this
      the number.  Also see Section 1.5.1.

   *

   pref:  UnsignedInt (optional).  The preference of this the number in
      relation to other numbers.  Also see Section 1.5.4.

   *

   label:  String (optional).  A custom label for the value, value.  Also see
      Section 1.5.3.

   "phones": {
     "tel0": {
       "contexts": {
         "private": true
       },
       "features": {
         "voice": true
       },
       "number": "tel:+1-555-555-5555;ext=5555",
       "pref": 1
     },
     "tel3": {
       "contexts": {
         "work": true
       },
       "number": "tel:+1-201-555-0123"
     }
   }

                         Figure 26: 27: phones example Example

2.3.4.  preferredLanguages

   Type : Id[LanguagePref] (optional). (optional)

   Defines the preferred languages for contacting the entity associated
   with this the Card.

   A LanguagePref object has the following properties:

   *

   @type:  String.  This MUST be LanguagePref, if set.

   *

   language:  String (mandatory).  The preferred language.  This MUST be
      a language tag as defined in [RFC5646].

   *

   contexts:  String[Boolean] (optional).  Defines the contexts in which
      to use this the language.  Also see Section 1.5.1.

   *

   pref:  UnsignedInt (optional).  Defines the preference of this the
      language in relation to other languages of the same contexts.
      Also see Section 1.5.4.

   "preferredLanguages": {
     "l1": {
       "language": "en",
       "contexts": {
         "work": true
       },
       "pref": 1
     },
     "l2": {
       "language": "fr",
       "contexts": {
         "work": true
       },
       "pref": 2
     },
     "l3": {
       "language": "fr",
       "contexts": {
         "private": true
       }
     }
   }

                   Figure 27: 28: preferredLanguages example Example

2.4.  Calendaring and Scheduling Properties

   This section defines properties how to schedule for scheduling calendar events with
   the entity represented by this the Card.

2.4.1.  calendars

   Type: Id[Calendar] (optional). (optional)

   These are resources for calendaring, calendaring such as using calendars to lookup look
   up free-busy information for the entity represented by this the Card.  A
   Calendar object has all properties of the Resource (Section 1.4.4)
   data type, with the following additional definitions:

   *  The @type property value MUST be Calendar, if set.

   *  The kind property is mandatory.  Its enumerated (Section 1.7.4)
      values are:

      -  calendar: the The resource is a calendar that contains entries such
         as calendar events or tasks.

      -  freeBusy: the The resource allows for free-busy lookups, for
         example
         example, to schedule group events.

   "calendars": {
     "calA": {
       "kind": "calendar",
       "uri": "webcal://calendar.example.com/calA.ics"
     },
     "project-a": {
       "kind": "freeBusy",
       "uri": "https://calendar.example.com/busy/project-a"
     }
   }

                        Figure 28: 29: calendars example Example

2.4.2.  schedulingAddresses

   Type: Id[SchedulingAddress] (optional). (optional)

   The scheduling addresses by which the entity may receive calendar
   scheduling invitations.  A SchedulingAddress object has the following
   properties:

   *

   @type:  String.  This MUST be SchedulingAddress, if set.

   *

   uri:  String (mandatory).  The address to use for calendar scheduling
      with this the contact.  This MUST be a URI as defined in Section 3 of
      [RFC3986].

   *

   contexts:  String[Boolean] (optional).  The contexts in which to use this
      the scheduling address.  Also see Section 1.5.1.

   *

   pref:  UnsignedInt (optional).  The preference of this the scheduling
      address in relation to other scheduling address. addresses.  Also see
      Section 1.5.4.

   *

   label:  String (optional).  A custom label for the scheduling
      address,
      address.  Also see Section 1.5.3.

   "schedulingAddresses": {
     "sched1": {
       "uri": "mailto:janedoe@example.com"
     }
   }

                   Figure 29: 30: schedulingAddresses example Example

2.5.  Address and Location Properties

   This section defines properties for postal addresses and geographical
   locations associated with the entity represented by this the Card.

2.5.1.  addresses

   Type: Id[Address] (optional). (optional)

   A map of address identifiers to Address objects, containing physical
   locations.

2.5.1.1.  Address object Object

   An Address object has the following properties:

   * properties, of which at least one
   of components, coordinates, countryCode, full or timeZone MUST be
   set:

   @type:  String.  This MUST be Address, if set.

   *

   components:  AddressComponent[] (optional).  The components
      (Section 2.5.1.2) making that make up this address.  This property MUST be
      set if the full property is not set, otherwise it SHOULD be set. address.  The component list
      MUST have at least one entry having that has a different kind other than separator.

      Address components SHOULD be ordered such that when their values
      are joined as a String produce String, a valid full address. address is produced.  If so,
      implementations MUST set the isOrdered property value to true.

      If the address components are ordered, then the defaultSeparator
      property and address components of kind separator give guidance on
      what characters to insert between components, but implementations
      are free to choose any others.  In lack of  When lacking a separator,
      inserting a single Space space character in between address component
      values is a good choice.

      If instead

      If, instead, the address components follow no particular order,
      then the isOrdered property value MUST be false, the components
      property MUST NOT contain a an AddressComponent of kind separator separator,
      and the defaultSeparator property MUST NOT be set.

   *

   isOrdered:  Boolean (optional, (optional; default: false).  This indicates  Indicates if the
      address component sequence in the components property is ordered.

   *

   countryCode:  String (optional).  The Alpha-2 country code
      [ISO.3166-1.2006].

   *
      [ISO.3166-1].

   coordinates:  String (optional).  A [RFC5870] "geo:" URI [RFC5870] for the
      address.

   *

   timeZone:  String (optional).  Identifies the time zone this the address
      is located in.  This MUST be a time zone name registered in the IANA IANA's
      Time Zone Database [IANATZ].

   * [IANA-TZ].

   contexts:  String[Boolean] (optional).  The contexts of the address
      information.  The boolean value MUST be true.  In addition to the
      common contexts (Section 1.5.1), allowed key values are:

      -

      *  billing: an address to be used for billing.

      -
      *  delivery: an address to be used for delivering physical items.

   *

   full:  String (optional).  This is the  The full address, including street, region
      region, or country.  The purpose of this property is to define an
      address, even if the individual address components are not known.  If the street property is set, the full property
      SHOULD NOT be set.

   *

   defaultSeparator:  String (optional).  The default separator to
      insert between address component values when concatenating all
      address component values to a single String.  Also see the
      definition of the separator kind for the AddressComponent
      (Section 2.5.1.2) object.  This property MUST NOT be set if the
      Address isOrdered property value is false or if the components
      property is not set.

   *

   pref:  UnsignedInt (optional).  The preference of this the address in
      relation to other addresses.  Also see Section 1.5.4.

   *

   phoneticScript:  String (optional).  The script used in the value of
      the AddressComponent phonetic property.  Also see Section 1.5.5.

   *

   phoneticSystem:  String (optional).  The phonetic system used in the
      AddressComponent phonetic property.  Also see Section 1.5.5.

   The following example illustrates the use of the address property.
   Additional examples are shown in Section 2.5.1.3.

   "addresses": {
     "k23": {
       "contexts": {
         "work": true
       },
       "components": [
         { "kind": "number", "value": "54321" },
         { "kind": "separator", "value": " " },
         { "kind": "name", "value": "Oak St" },
         { "kind": "locality", "value": "Reston" },
         { "kind": "region", "value": "VA" },
         { "kind": "separator", "value": " " },
         { "kind": "postcode", "value": "20190" },
         { "kind": "country", "value": "USA" }
       ],
       "countryCode": "US",
       "defaultSeparator": ", ",
       "isOrdered": true
     }
   }

        Figure 30: 31: Example of the address Address "54321 Oak St, Reston, VA
                                20190, USA"

2.5.1.2.  AddressComponent object Object

   An AddressComponent object has the following properties:

   *

   @type:  String.  This MUST be AddressComponent, if set.

   *

   value:  String (mandatory).  The value of this the address component.

   *

   kind:  String (mandatory).  The kind of this the address component.  The
      enumerated (Section 1.7.4) values are:

      -

      *  room: the room or room, suite number number, or identifier.

      -
      *  apartment: the extension designation, designation such as the apartment number
         or unit
         number, unit, or box number.

      -
      *  floor: the floor or level this the address is located on.

      -
      *  building: the building, tower, or condominium this the address is
         located in.

      -
      *  number: the street number, e.g., "123".  This value is not
         restricted to numeric values, values and can include any value such as
         number ranges ("112–10"), ("112-10"), grid style ("39.2 RD"), alphanumerics
         ("N6W23001")
         ("N6W23001"), or fractionals ("123 1/2").

      -
      *  name: the street name.

      -
      *  block: the block name or number.

      -
      *  subdistrict: the subdistrict, ward ward, or other subunit of a
         district.

      -
      *  district: the district name.

      -
      *  locality: the municipality, city, town, village, post-town, post town, or
         another
         other locality.

      -
      *  region: the administrative area, area such as province, state,
         prefecture, county, or canton.

      -
      *  postcode: the postal code, post code, ZIP code code, or other short
         code associated with the address by the relevant country's
         postal system.

      -
      *  country: the country name.

      -
      *  direction: the Cardinal cardinal direction or quadrant, e.g., "North".

      - "north".
      *  landmark: the publicly known prominent feature that can
         substitute the street name and number, e.g., White House, Taj
         Mahal.

      - "White House" or
         "Taj Mahal".
      *  postOfficeBox: the post office box number or identifier.

      -
      *  separator: a formatting separator between two ordered address
         non-separator components.  The value property of the component
         includes the verbatim separator, for example example, a hyphen
         character or even an empty string.  This value has higher
         precedence than the defaultSeparator property of the Address.
         Implementations MUST NOT insert two consecutive separator components, instead
         components; instead, they SHOULD insert a single separator
         component with the combined value.  This component kind MUST
         NOT be set if the Address isOrdered property value is false.

   *

   phonetic:  String (optional).  This defines  Defines how to pronounce this the name
      component.  If this property is set, then at least one of the
      Address object phoneticSystem or phoneticScript properties MUST be
      set.  Also see Section 1.5.5.

2.5.1.3.  Address examples

   The following are examples Examples

   Examples of addresses, in addition to addresses are shown below; also see Figure 30. 31.

   "addresses": {
     "k25": {
       "components": [
         { "kind": "number", "value": "46" },
         { "kind": "name", "value": "1 Sukhumvit 51 Alley" },
         { "kind": "subdistrict", "value": "Khlong Tan Nuea" },
         { "kind": "district", "value": " Watthana" },
         { "kind": "locality", "value": "Bangkok" },
         { "kind": "country", "value": "Thailand" },
         { "kind": "postcode", "value": "10110" }
       ],
       "defaultSeparator": ", ",
       "isOrdered": true
     }
   }

        Figure 31: 32: Example of the address Address "46, 1 Sukhumvit 51 Alley,
            Khlong Tan Nuea, Watthana, Bangkok 10110, Thailand"

   The following example illustrates the use of an address in Tokyo and
   its localization (Section 2.7.1) in Japanese.

   "addresses": {
      "k26": {
        "components": [
          { "kind": "block", "value": "2-7" },
          { "kind": "separator", "value": "-" },
          { "kind": "number", "value": "2" },
          { "kind": "separator", "value": " " },
          { "kind": "district", "value": "Marunouchi" },
          { "kind": "locality", "value": "Chiyoda-ku" },
          { "kind": "region", "value": "Tokyo" },
          { "kind": "separator", "value": " " },
          { "kind": "postcode", "value": "100-8994" }
        ],
        "defaultSeparator": ", ",
        "full": "2-7-2 Marunouchi, Chiyoda-ku, Tokyo 100-8994",
        "isOrdered": true
      }
   },
   "localizations": {
     "jp": {
       "addresses/k26": {
         "components": [
           { "kind": "region", "value": "東京都" },
           { "kind": "locality", "value": "千代田区" },
           { "kind": "district", "value": "丸ノ内" },
           { "kind": "block", "value": "2-7" },
           { "kind": "separator", "value": "-" },
           { "kind": "number", "value": "2" },
           { "kind": "postcode", "value": "〒100-8994" }
         ],
         "defaultSeparator": "",
         "full": "〒100-8994東京都千代田区丸ノ内2-7-2",
         "isOrdered": true
       }
     }
   }

     Figure 32: 33: Example of an address Address in Tokyo and its localization
                         Section 2.7.1 Its Localization in Japanese.
                                  Japanese

2.6.  Resource Properties

   This section defines properties for digital resources associated with
   the entity represented by this the Card.

2.6.1.  cryptoKeys

   Type: Id[CryptoKey] (optional). (optional)

   These are cryptographic resources such as public keys and
   certificates associated with the entity represented by this the Card.  A
   CryptoKey object has all properties of the Resource (Section 1.4.4)
   data type, with the following additional definitions: definition:

   *  The @type property value MUST be CryptoKey, if set.

   The following example shows how to refer to an external cryptographic
   resource.

   "cryptoKeys": {
     "mykey1": {
       "uri": "https://www.example.com/keys/jdoe.cer"
     }
   }

            Figure 33: 34: Example of cryptoKeys example with external data External Data

   The following example shows how to embed key data in the CryptoKey.
   The key data is depicted in multiple lines only for demonstration
   purposes.

   "cryptoKeys": {
     "mykey2": {
       "uri": "data:application/pgp-keys;base64,LS0tLS1CRUdJTiBSU0EgUFVCTElDIEtF
               WS0tLS0tCk1JSUJDZ0tDQVFFQSt4R1ovd2N6OXVnRnBQMDdOc3BvNlUxN2wwWWhGa
               UZweHhVNHBUazNMaWZ6OVIzenNJc3UKRVJ3dGE3K2ZXSWZ4T28yMDhldHQvamhza2
               lWb2RTRXQzUUJHaDRYQmlweVdvcEt3WjkzSEhhRFZaQUFMaS8yQQoreFRCdFdkRW8
               3WEdVdWpLRHZDMi9hWkt1a2ZqcE9pVUk4QWhMQWZqbWxjRC9VWjFRUGgwbUhzZ2xS
               TkNtcEN3Cm13U1hBOVZObWh6K1BpQitEbWw0V1duS1cvVkhvMnVqVFh4cTcrZWZNV
               TRIMmZueTNTZTNLWU9zRlBGR1oxVE4KUVNZbEZ1U2hXckhQdGlMbVVkUG9QNkNWMm
               1NTDF0aytsN0RJSXFYclFoTFVLREFDZU01cm9NeDBrTGhVV0I4UAorMHVqMUNObE5
               ONEpSWmxDN3hGZnFpTWJGUlU5WjRONll3SURBUUFCCi0tLS0tRU5EIFJTQSBQVUJM
               SUMgS0VZLS0tLS0K" "data:application/pgp-keys;base64,LS0tLS1CRUdJTiBSU0EgUFVC
               TElDIEtFWS0tLS0tCk1JSUJDZ0tDQVFFQSt4R1ovd2N6OXVnRnBQMDdOc
               3BvNlUxN2wwWWhGaUZweHhVNHBUazNMaWZ6OVIzenNJc3UKRVJ3dGE3K2
               ZXSWZ4T28yMDhldHQvamhza2lWb2RTRXQzUUJHaDRYQmlweVdvcEt3Wjk
               zSEhhRFZaQUFMaS8yQQoreFRCdFdkRW83WEdVdWpLRHZDMi9hWkt1a2Zq
               cE9pVUk4QWhMQWZqbWxjRC9VWjFRUGgwbUhzZ2xSTkNtcEN3Cm13U1hBO
               VZObWh6K1BpQitEbWw0V1duS1cvVkhvMnVqVFh4cTcrZWZNVTRIMmZueT
               NTZTNLWU9zRlBGR1oxVE4KUVNZbEZ1U2hXckhQdGlMbVVkUG9QNkNWMm1
               NTDF0aytsN0RJSXFYclFoTFVLREFDZU01cm9NeDBrTGhVV0I4UAorMHVq
               MUNObE5ONEpSWmxDN3hGZnFpTWJGUlU5WjRONll3SURBUUFCCi0tLS0tR
               U5EIFJTQSBQVUJMSUMgS0VZLS0tLS0K"
     }
   }

            Figure 34: 35: Example of cryptoKeys example with embedded data Embedded Data

2.6.2.  directories

   Type: Id[Directory] (optional). (optional)

   These are directory service resources, resources such as entries in a directory
   or organizational directories for lookup.  A Directory object has all
   properties of the Resource (Section 1.4.4) data type, with the
   following additional definitions:

   *  The @type property value MUST be Directory, if set.

   *  The kind property is mandatory.  Its enumerated (Section 1.7.4)
      values are:

      -  directory: the resource is a directory service where that the entity
         represented by this the Card is a part of.  This typically is an
         organizational directory that also contains associated
         entities, e.g., co-workers and management in a company
         directory.

      -  entry: the resource is a directory entry of the entity
         represented by this the Card.  In contrast to the directory type,
         this is the specific URI for the entity _within_ a directory.

   In addition, the Directory object has the following property:

   *

   listAs:  UnsignedInt (optional).  This defines  Defines the position of this the
      directory resource in the list of all Directory objects having the
      same kind in this the Card.  If set, the listAs value MUST be higher
      than zero.  Multiple directory resources MAY have the same listAs
      property value, value or none.  Sorting such entries is implementation-
      specific.

   "directories": {
     "dir1": {
       "kind": "entry",
       "uri": "https://dir.example.com/addrbook/jdoe/Jean%20Dupont.vcf"
     },
     "dir2": {
       "kind": "directory",
       "uri": "ldap://ldap.example/o=Example%20Tech,ou=Engineering",
       "pref": 1
     }

                       Figure 35: 36: directories example Example

2.6.3.  links

   Type: Id[Link] (optional). (optional)

   These are links to resources that do not fit any of the other use-
   case specific
   case-specific resource properties.  A Link object has all properties
   of the Resource (Section 1.4.4) data type, with the following
   additional definitions:

   *  The @type property value MUST be Link, if set.

   *  The kind property is optional.  Its enumerated (Section 1.7.4)
      values are:

      -  contact: the resource is a URI by which the entity represented
         by this the Card may be contacted, including contacted; this includes web forms or other
         media that require user interaction.

   "links": {
     "link3": {
       "kind": "contact",
       "uri": "mailto:contact@example.com",
       "pref": 1
     }
   }

                          Figure 36: 37: links example Example

2.6.4.  media

   Type: Id[Media] (optional). (optional)

   These are media resources such as photographs, avatars, or sounds
   that are associated with the entity represented by this the Card.  A Media
   object has all properties of the Resource (Section 1.4.4) data type,
   with the following additional definitions:

   *  The @type property value MUST be Media, if set.

   *  The kind property is mandatory.  Its enumerated (Section 1.7.4)
      values are:

      -  photo: the resource is a photograph or avatar.

      -  sound: the resource is audio media, e.g., to specify the proper
         pronunciation of the name property contents.

      -  logo: the resource is a graphic image or logo associated with
         the entity represented by this the Card.

   "media": {
     "res45": {
       "kind": "sound",
       "uri": "CID:JOHNQ.part8.19960229T080000.xyzMail@example.com"
     },
     "res47": {
       "kind": "logo",
       "uri": "https://www.example.com/pub/logos/abccorp.jpg"
     },
     "res1": {
       "kind": "photo",
       "uri": "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAASABIAAD/4..."
     }
   }

                          Figure 37: 38: media example Example

2.7.  Multilingual Properties

   This section defines properties how to localize for localizing the content of this the
   Card in human languages.

2.7.1.  localizations

   Type: String[PatchObject] (optional). (optional)

   This localizes property values in this Card to languages other (other than the main language.
   language) in the Card.  Localizations provide language-specific
   alternatives for existing property values and SHOULD NOT add new
   properties.

   The keys in the localizations property object are language tags
   [RFC5646].  The values are patch objects which that localize the Card in
   the respective language tag.  The paths in the PatchObject are
   relative to the Card that includes the localizations property.  A
   patch MUST NOT target the localizations property.

   Conceptually, a Card is localized as follows:

   *  Determine the language tag in which this the Card should be localized
      in. localized.

   *  If the localizations property includes a key for that language,
      obtain the PatchObject value.  If there is no such key, stop.

   *  Create a copy of the Card, but do not copy the localizations
      property.

   *  Apply all patches in the PatchObject to the copy of the Card.

   *  Optionally, set the language property in the copy of the Card.

   *  Use the patched copy of the Card as the localized variant of the
      original Card.

   A patch in the PatchObject may contain any value type.  Its value
   MUST be a valid value according to the definition of the patched
   property.

   Figure 38 39 localizes the name property by completely replacing its
   contents in Ukrainian language with Cyrillic script.

   {
     "name": {
       "components": [
         { "kind": "title", "value": "Mr." },
         { "kind": "given", "value": "Ivan" },
         { "kind": "given2", "value": "Petrovich" },
         { "kind": "surname", "value": "Vasiliev" }
       ]
     },
     "localizations": {
       "uk-Cyrl": {
         "name": {
           "components": [
             { "kind": "title", "value": "г-н" },
             { "kind": "given", "value": "Иван" },
             { "kind": "given2", "value": "Петрович" },
             { "kind": "surname", "value": "Васильев" }
           ]
         }
       }
     }
   }

           Figure 38: 39: Example for localizing of Localizing a top-level property Top-Level Property

   Figure 39 40 localizes the title name by patching _inside_ the titles
   property.  All properties but properties, except the name property in the Title object
   object, are left as-is. as is.

   "name": {
     "full": "Gabriel García Márquez"
   },
   "titles": {
     "t1": {
       "kind": "title",
       "name": "novelist"
     }
   },
   "localizations": {
     "es": {
       "titles/t1/name": "autor"
     }
   }

             Figure 39: 40: Example for localizing of Localizing a nested property Nested Property

2.8.  Additional Properties

   This section defines properties for which none of the previous
   sections are appropriate.

2.8.1.  anniversaries

   Type :

   Type: Id[Anniversary] (optional). (optional)

   These are memorable dates and events for the entity represented by
   this
   the Card.  An Anniversary object has the following properties:

   *

   @type:  String.  This MUST be Anniversary, if set.

   *

   kind:  String (mandatory).  Specifies the kind of the anniversary.  The
      enumerated (Section 1.7.4) values are:

      -

      *  birth: a birthday anniversary

      -
      *  death: a deathday anniversary

      -
      *  wedding: a wedding day anniversary

   *

   date:  PartialDate|Timestamp (mandatory, (mandatory; defaultType: PartialDate).
      The date of this the anniversary in the Gregorian calendar.  This MUST
      either
      be either a whole or partial calendar date or a complete UTC
      timestamp (see the definition of the Timestamp and PartialDate
      object types below).

   *

   place:  Address (optional).  An address associated with this
      anniversary, e.g., the place of birth or death.

   A PartialDate object represents a complete or partial calendar date
   in the Gregorian calendar.  It represents either a complete date, or a year, or a
   month in a year, or a day in a month.  It has the following
   properties, of which at least year or month and day MUST be set:

   *

   @type:  String.  This MUST be PartialDate, if set.

   *

   year:  UnsignedInt (optional).  This is the  The calendar year.

   *

   month:  UnsignedInt (optional).  This is the  The calendar month, represented as
      the integers 1 <= month <= 12.  If this property is
      set set, then
      either year or day MUST be set.

   *

   day:  UnsignedInt (optional).  This is the  The calendar month day, represented as
      the integers 1 <= day <= 31, depending on the validity within the
      month and year.  If this property is set set, then month MUST be set.

   *

   calendarScale:  String (optional).  This is the  The calendar system in which this
      date occurs, in lowercase.  This MUST be either a CLDR-
      registered calendar system
      name registered as a Common Locale Data Repository (CLDR)
      [RFC7529] or a vendor-specific value.  The year, month month, and day
      still MUST be represented in the Gregorian calendar.  Note that
      the year property might be required to convert the date between
      the Gregorian calendar and the respective calendar system.

   A Timestamp object has the following properties:

   *

   @type:  String.  This MUST be Timestamp, if set.

   *

   utc:  UTCDateTime (mandatory).  Specifies the point in time in UTC
      time.

   Figure 40 41 illustrates anniversaries with partial dates and a
   timestamp.  Note how the @type property is set for the Timestamp
   object value according to the rules defined in Section 1.3.4.

   "anniversaries": {
     "k8": {
       "kind": "birth",
       "date": {
         "year": 1953,
         "month": 4,
         "day": 15
       }
     },
     "k9": {
       "kind": "death",
       "date": {
         "@type": "Timestamp",
         "utc": "2019-10-15T23:10:00Z"
       },
       "place": {
         "full": "4445 Tree Street\nNew England, ND 58647\nUSA"
       }
     }
   }

                      Figure 40: 41: anniversaries example Example

2.8.2.  keywords

   Type: String[Boolean] (optional). (optional)

   A set of free-text keywords, also known as _tags_.  The set is
   represented as an object, with each key being a keyword.  The boolean
   value MUST be true.

   "keywords": {
     "internet": true,
     "IETF": true
   }

                        Figure 41: 42: keywords example Example

2.8.3.  notes

   Type: Id[Note] (optional). (optional)

   Free-text notes that are associated with this the Card.  A Note object has
   the following properties:

   *

   @type:  String.  This MUST be Note, if set.

   *

   note:  String (mandatory).  The free text free-text value of this note.

   *

   created:  UTCDateTime (optional).  The date and time when this note
      was created.

   *

   author:  Author (optional).  The author of this note.

   An Author object has the following properties, of which at least one
   property other than @type MUST be set:

   *

   @type:  String.  This MUST be Author, if set.

   *

   name:  String (optional).  The name of this author.

   *

   uri:  String (optional).  A URI value that identifies the author.

   "notes": {
     "n1": {
       "note": "Open office hours are 1600 to 1715 EST, Mon-Fri",
       "created": "2022-11-23T15:01:32Z",
       "author": {
         "name": "John"
       }
     }
   }

                          Figure 42: 43: notes example Example

2.8.4.  personalInfo

   Type: Id[PersonalInfo] (optional). (optional)

   Defines personal information about the entity represented by this the
   Card.  A PersonalInfo object has the following properties:

   *

   @type:  String.  This MUST be PersonalInfo, if set.

   *

   kind:  String (mandatory).  Specifies the kind of this personal
      information.  The enumerated (Section 1.7.4) values are:

      -

      *  expertise: a field of expertise or a credential

      -

      *  hobby: a hobby

      -

      *  interest: an interest

   *

   value:  String (mandatory).  The actual information.

   *

   level:  String (optional).  Indicates the level of expertise, expertise or
      engagement in hobby or interest.  The enumerated (Section 1.7.4)
      values are:

      -

      *  high

      -

      *  medium

      -  low

      *  low

   listAs:  UnsignedInt (optional).  This defines  Defines the position of this the
      personal information in the list of all PersonalInfo objects
      having that
      have the same kind in this the Card.  If set, the listAs value MUST be
      higher than zero.  Multiple personal information entries MAY have
      the same listAs property value, value or none.  Sorting such entries is
      implementation-specific.

   *

   label:  String (optional).  A custom label.  See Section 1.5.3.

   "personalInfo": {
     "pi2": {
       "kind": "expertise",
       "value": "chemistry",
       "level": "high"
     },
     "pi1": {
       "kind": "hobby",
       "value": "reading",
       "level": "high"
     },
     "pi6": {
       "kind": "interest",
       "value": "r&b music",
       "level": "medium"
     }
   }

                      Figure 43: 44: personalInfo example Example

3.  IANA Considerations

3.1.  Media Type Registration

   [I-D.ietf-calext-jscontact]

   This document defines a media type for use with JSContact data
   formatted in JSON.

   Type name:  application

   Subtype name:  jscontact+json

   Required parameters:  None

   Optional parameters:  version

      This parameter conveys the version of the JSContact data in the
      body part.  It MUST NOT occur more than once.  If this parameter
      is set, then the values of all JSContact version (Table 2)
      properties in the body part MUST match the parameter value.

   Encoding considerations:  This is the same as the encoding
      considerations of application/
      json, application/json, as specified in Section 11 of
      [RFC8259].

   Security considerations:  See Section 4 of [I-D.ietf-calext-jscontact]. RFC 9553.

   Interoperability considerations:  While JSContact is designed to
      avoid ambiguities as much as possible, when converting objects
      from other contact formats to/
      from to/from JSContact, it is possible that
      differing representations for the same logical data or ambiguities
      in interpretation might arise.  The semantic equivalence of two
      JSContact objects may be determined differently by different
      applications, for example, where URL values differ in case between
      the two objects.

   Published specification:
      TBD  RFC 9553

   Applications that use this media type:  Applications that currently
      make use of the text/vcard text/vCard media type can use this as an
      alternative.

   Fragment identifier considerations:  A JSON Pointer fragment
      identifier may be used, as defined in [RFC6901], Section 6.

   Additional information:

      Magic number(s):  N/A
      File extensions(s):  N/A
      Macintosh file type code(s):  N/A

   Person & email address to contact for further information:
      calsify@ietf.org

   Intended usage:  COMMON

   Restrictions on usage:  N/A

   Author:  See the "Author's Address" "Authors' Addresses" section of [I-D.ietf-calext-jscontact]. RFC 9553.

   Change controller:  IETF

3.2.  Creation of the "JSContact" JSContact Registry Group

   IANA is asked to create has created the "JSContact" registry group.  The new registry
   definitions in the following sections all belong to that group.

3.3.  Registry Policy and Change Procedures

   Registry assignments that introduce backwards-incompatible
   (Section 1.9) changes require the JSContact major version to change, change;
   other changes only require to a change to the minor version.  The
   registry policy for assignments that require the JSContact major
   version to change is Standards Action ([RFC8126], Section 4.9).  The
   registry policy for other assignments is Specification Required
   ([RFC8126], Section 4.6).

   The Designated Expert designated expert (DE) decides if a major or minor version change
   is required and assigns the new version to the Version Registry "JSContact Version"
   registry (Section 3.4).  Version numbers increment by one, and a
   major version change resets the minor version to zero.  An assignment
   may apply multiple changes and to more than one registry at once, in
   which case a single version change is sufficient.  If the registry
   policy is Specification Required, then the Designated Expert DE may decide that it is
   enough to document the new assignment in the Description item of the
   respective registry.

   A registration MUST have an intended usage of common, reserved, or
   obsolete.

   *  A common usage denotes an item with shared semantics and syntax
      across systems.  Up-to-date systems MUST expect such items to
      occur in JSContact data.

   *  A reserved usage reserves an item in the registry without
      assigning semantics to avoid name collisions with future
      extensions or protocol use.  Implementations MUST NOT expect or
      add items with such names outside the protocols or extensions that
      use them; otherwise, any such JSContact data is invalid.

   *  An obsolete usage denotes an item that is no longer expected to be
      added by up-to-date systems.  A new assignment has probably been
      defined
      defined, covering the obsolete item's semantics.  Implementations
      MUST expect such items to occur in JSContact data up to the "Until
      Version" registry field, inclusively.  They MUST NOT add such
      items for any version after which the item got obsolete;
      otherwise, any such JSContact data is invalid.

   The intended usage of registry items may change between versions, but
   the designated expert must carefully consider the impact on existing
   implementations and standards before doing so.

   The registration procedure is not a formal standards process but
   rather an administrative procedure intended to allow community
   comment
   comments and to check whether it is coherent without excessive time
   delay.  It is designed to encourage vendors to document and register
   new items they add for use cases not covered by the original
   specification, leading to increased interoperability.

3.3.1.  Preliminary Community Review

   Notice of a potential new registration MUST be sent to the Calext WG
   mailing list <calsify@ietf.org> for review.  This mailing list is
   appropriate to solicit for soliciting community feedback on a proposed registry
   assignment.

   The intent of the public posting to this list is to solicit comments
   and feedback on the choice of the item name or value, the unambiguity
   of its description, and a review of any interoperability or security
   considerations.  The submitter may submit a revised registration
   proposal or abandon the registration completely at any time.

3.3.2.  Submit Request to IANA

   Registration requests can be sent to IANA <iana@iana.org>.

3.3.3.  Designated Expert Review

   The primary concern of the designated expert (DE) DE is preventing name collisions and
   encouraging the submitter to document security and privacy
   considerations.

   A new type name, property name name, or enumerated value MUST NOT differ
   only in case from an already registered already-registered name or value.

   For a common-use registration, the DE is expected to confirm that
   suitable documentation is available to ensure interoperability.  The
   DE should also verify that the new assignment does not conflict with
   work that is active or already published within the IETF.

   The DE will either approve or deny the registration request and
   publish a notice of the decision to the Calext WG mailing list or its
   successor, as well as inform IANA.  A denial notice must be justified
   by an explanation, and, and in the cases where it is possible, concrete
   suggestions on how the request can be modified to become acceptable
   should be provided.

3.3.4.  Change Procedures

   Once a JSContact registry group item has been published by IANA, the
   change controller
   Change Controller may request a change to its definition.  The same
   procedure that would be appropriate for the original registration
   request is used to process a change request.

   JSContact registrations dot do not get deleted; instead, items that are
   no longer believed appropriate for use are declared obsolete by a
   change to their "intended usage" "Intended Usage" field; such items will be clearly
   marked in the IANA registry.

   Significant changes to a JSContact registry item's definition should
   be requested only when there are serious omissions or errors in the
   published specification, as such changes may cause interoperability
   issues.  When review is required, a change request may be denied if
   it renders entities that were valid under the previous definition
   invalid under the new definition.

3.4.  Creation of the "JSContact Version" JSContact Version Registry

   IANA is asked to create has created the "JSContact Version" registry.  The purpose of
   this new registry is to define the allowed value range of JSContact
   major and minor version numbers.

   The registry entries sort numerically in ascending order by the
   "Major Version" column.

   The registry process is outlined in Section 3.3.

3.4.1.  "JSContact Version"  JSContact Version Registry Template

   Major Version:  This is the  The numeric value of a JSContact major version
      number.  It MUST be a positive integer.

   Highest Minor Version:  This is the  The maximum numeric value of a JSContact
      minor version for the given major version.  It MUST be zero or a
      positive integer.  All numbers less than or equal to this value
      are valid minor version values for the given major version.

3.4.2.  Initial Contents for of the "JSContact Version" JSContact Version Registry

   The following table lists the initial valid major and minor version
   number ranges.

                 +===============+=======================+

           +===============+=======================+===========+
           | Major Version | Highest Minor Version |
                 +===============+=======================+ Reference |
           +===============+=======================+===========+
           | 1             | 0                     |
                 +---------------+-----------------------+ RFC 9553  |
           +---------------+-----------------------+-----------+

                    Table 1: JSContact Versions Version Registry

3.5.  Creation of the "JSContact Properties" JSContact Properties Registry

   IANA is asked to create has created the "JSContact Properties" registry.  The purpose of
   this new registry is to allow interoperability of extensions to
   JSContact objects objects.

   The registry entries sort alphabetically in ascending order by the
   following columns: "Property Name" column first, "Property Context" second,
   and "Since Version" third.  Equal entries sort in any order.

   The registry process for a new property is outlined in Section 3.3.

3.5.1.  "JSContact Properties"  JSContact Properties Registry Template

   Property Name:  This is the  The name of the property.  The property name MUST NOT
      already be registered for any of the object types listed in the
      "Property Context" field of this registration.  Other object types
      MAY already have already registered a different property with the same
      name; however, the same name MUST only be used when the semantics
      are analogous.

   Property Type:  This  For properties with intended usage other than
      "reserved", this is the type of this property, using type
      signatures,
      signatures as specified in Section 1.3.2.  The property type MUST
      be registered in the "JSContact Types" registry.  For reserved
      property names, the value MUST be the verbatim string "not
      applicable".

   Property Context:  This is a  A comma-separated list of JSContact object types
      (Section 3.6.2) that contain this property.

   Reference or Description:  This is a brief description or RFC number
      and section reference where the property.  For reserved property is specified (omitted for
      "reserved" property names).  This must include references to all
      RFC documents where this property is introduced or updated.
      names, the value MAY be the verbatim string "not applicable".

   Intended Usage:  This may  May be "common", "reserved", or "obsolete".

   Since Version:  This defines the  The JSContact version on which this the property
      definition is based on. based.  The version MUST be one of the allowed
      values of the version property in the JSContact "JSContact Enum Value Values"
      registry (see Table 1).

   Until Version:  This defines the  The JSContact version after which this the property got obsoleted and was
      obsoleted; therefore, it MUST NOT be used in later versions.  The
      Until Version value either MUST NOT be set, set or MUST be one of the
      allowed values of the version property in the JSContact "JSContact Enum Value
      Values" registry (see Table 1).

   Change Controller:  This is who may request a change to this the entry's
      definition (IETF for RFCs from the IETF stream).

   Reference or Description:  A brief description or RFC number and
      section reference where the property is specified.  This must
      include references to all RFC documents where this property is
      introduced or updated.  For reserved property names, the reference
      or description MAY be omitted.

3.5.2.  Initial Contents for of the "JSContact Properties" JSContact Properties Registry

   The following table lists the initial common usage entries of the
   "JSContact Properties" registry.  The  For all properties, the Since
   Version for all
   properties is 1.0.  The 1.0, the Until Version for all properties is not set.
   All set, the Change Controller
   is IETF, and RFC section references are for [I-D.ietf-calext-jscontact].  The
   change controller for all these properties is IETF.

   +===================+=====================+=========================+============+ RFC 9553.

   +===================+=====================+==================+========+
   |Property Name      |Property Type        |Property Context         |Reference or|
   |                   |  |Ref     |                         |Description |
   +===================+=====================+=========================+============+
   +===================+=====================+==================+========+
   |@type              |String               |Address,                 |Section     |          |Sections|
   |                   |                     |AddressComponent, |2.5.1,  |
   |                   |                     |Anniversary, Author,     |Section     |
   |                   |                     |Card, Calendar,      |2.8.1,  |
   |                   |                     |CryptoKey, Directory,    |Section     |
   |                   |                     |EmailAddress,                     |Author, Card,     |2.1.1,  |
   |                   |                     |LanguagePref, Link,      |Section     |
   |                   |                     |Media, Name,                     |Calendar,         |2.4.1,  |
   |                   |                     |NameComponent, Nickname, |Section     |
   |                   |                     |Note, OnlineService,                     |CryptoKey,        |2.6.1,  |
   |                   |                     |Organization, OrgUnit,   |Section     |
   |                   |                     |PartialDate,PersonalInfo,|2.6.2,      |
   |                   |                     |Phone, Pronouns,         |Section                     |Directory,        |2.6.2,  |
   |                   |                     |Relation,                     |EmailAddress,     |2.3.1,  |
   |                   |                     |SchedulingAddress,       |Section     |
   |                   |                     |SpeakToAs, Timestamp,                     |LanguagePref,     |2.3.4,  |
   |                   |                     |Title                    |Section     |
   |                   |                     |                         |2.6.3,      |
   |                   |                     |                         |Section     |                     |Link, Media, Name,|2.6.3,  |
   |                   |                     |NameComponent,    |2.6.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Nickname, Note,   |2.2.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                         |2.2.1.3,    |
   |                   |                     |                         |Section     |
   |                     |OnlineService,    |2.2.1.3,|
   |                   |                     |Organization,     |2.8.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |OrgUnit,          |2.3.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |PartialDate,      |2.2.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |PersonalInfo,     |2.8.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Phone, Pronouns,  |2.3.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Relation,         |2.2.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                         |2.1.8,      |
   |                   |                     |                         |Section     |                     |SchedulingAddress,|2.1.8,  |
   |                   |                     |SpeakToAs,        |2.4.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Timestamp, Title  |2.2.4   |
   +-------------------+---------------------+-------------------------+------------+
   |version            |String               |Card                     |Section     |
   |                   |                     |                         |2.1.2       |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |address            |String               |EmailAddress      |Section |
   |                   |                     |                  |2.3.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |addresses          |Id[Address]          |Card              |Section |
   |                   |                     |                  |2.5.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |anniversaries      |Id[Anniversary]      |Card              |Section |
   |                   |                     |                  |2.8.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |author             |Author               |Note              |Section |
   |                   |                     |                  |2.8.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |calendars          |Id[Calendar]         |Card              |Section |
   |                   |                     |                  |2.4.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |calendarScale      |String               |PartialDate       |Section |
   |                   |                     |                  |2.8.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |components         |AddressComponent[]   |Address           |Section |
   |                   |                     |                  |2.5.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |components         |NameComponent[]      |Name              |Section |
   |                   |                     |                  |2.2.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |contexts           |String[Boolean]      |Address, Calendar,       |Section     | Calendar,|Sections|
   |                   |                     |CryptoKey, Directory,    |1.5.1,        |1.4.4,  |
   |                   |                     |EmailAddress,            |Section                     |Directory,        |1.5.1,  |
   |                   |                     |LanguagePref, Link,                     |EmailAddress,     |2.5.1,  |
   |                   |                     |Media, Nickname,         |Section     |
   |                   |                     |OnlineService,                     |LanguagePref,     |2.4.1,  |
   |                   |                     |Organization, Phone,     |Section     |
   |                   |                     |Pronouns,                     |Link, Media,      |2.6.1,  |
   |                   |                     |SchedulingAddress        |Section     |
   |                   |                     |                     |Nickname,         |2.6.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |OnlineService,    |2.3.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Organization,     |2.3.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Phone, Pronouns,  |2.6.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |SchedulingAddress |2.6.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                         |2.2.1.3,    |
   |                   |                     |                         |Section     |                  |2.2.1.3,|
   |                   |                     |                  |2.3.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.2.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.3.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.2.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                         |2.4.2Section|
   |                   |                     |                         |1.4.4                  |2.4.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |coordinates        |String               |Address           |Section |
   |                   |                     |                  |2.5.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |countryCode        |String               |Address           |Section |
   |                   |                     |                  |2.5.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |created            |UTCDateTime          |Card, Note               |Section     |        |Sections|
   |                   |                     |                  |2.1.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.8.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |date               |PartialDate|Timestamp|Anniversary       |Section |
   |                   |                     |                  |2.8.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |day                |UnsignedInt          |PartialDate       |Section |
   |                   |                     |                  |2.8.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |defaultSeparator   |String               |Address, Name            |Section     |     |Sections|
   |                   |                     |                  |2.5.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.2.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |directories        |Id[Directory]        |Card              |Section |
   |                   |                     |                  |2.6.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |emails             |Id[EmailAddress]     |Card              |Section |
   |                   |                     |                  |2.3.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |features           |String[Boolean]      |Phone             |Section |
   |                   |                     |                  |2.3.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |full               |String               |Address, Name            |Section     |     |Sections|
   |                   |                     |                  |2.5.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.2.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |grammaticalGender  |String               |SpeakToAs         |Section |
   |                   |                     |                  |2.2.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |isOrdered          |Boolean              |Address, Name            |Section     |     |Sections|
   |                   |                     |                  |2.5.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.2.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |keywords           |String[Boolean]      |Card              |Section |
   |                   |                     |                  |2.8.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |kind               |String               |AddressComponent,        |Section     | |Sections|
   |                   |                     |Anniversary, Calendar,      |2.5.1,  |
   |                   |                     |Card, CryptoKey,         |Section     |
   |                   |                     |Directory, Link, Media,                     |Calendar, Card,   |2.8.1,  |
   |                   |                     |NameComponent,           |Section     |
   |                   |                     |PersonalInfo, Title                     |CryptoKey,        |2.4.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Directory, Link,  |2.1.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Media,            |2.6.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |NameComponent,    |2.6.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |PersonalInfo,     |2.6.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Title             |2.6.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.2.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.8.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.2.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |label              |String               |Calendar, CryptoKey,     |Section     |         |Sections|
   |                   |                     |Directory, EmailAddress, |1.5.3,                     |CryptoKey,        |1.4.4,  |
   |                   |                     |Link, Media,             |Section                     |Directory,        |1.5.3,  |
   |                   |                     |OnlineService,                     |EmailAddress,     |2.4.1,  |
   |                   |                     |PersonalInfo, Phone,     |Section     |
   |                   |                     |SchedulingAddress                     |Link, Media,      |2.6.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |OnlineService,    |2.6.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |PersonalInfo,     |2.3.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Phone,            |2.6.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |SchedulingAddress |2.6.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.3.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.8.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.3.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                         |2.4.2,      |
   |                   |                     |                         |Section     |
   |                   |                     |                         |1.4.4                  |2.4.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |language           |String               |Card, LanguagePref       |Section     | LanguagePref|Sections|
   |                   |                     |                  |2.1.5,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.3.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |level              |String               |PersonalInfo      |Section |
   |                   |                     |                  |2.8.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |links              |Id[Link]             |Card              |Section |
   |                   |                     |                  |2.6.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |listAs             |UnsignedInt          |Directory, PersonalInfo  |Section     |
   |        |Sections|
   |                   |                     |PersonalInfo      |2.6.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.8.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |localizations      |String[PatchObject]  |Card              |Section |
   |                   |                     |                  |2.7.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |media              |Id[Media]            |Card              |Section |
   |                   |                     |                  |2.6.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |mediaType          |String               |Calendar, CryptoKey,     |Section     |         |Sections|
   |                   |                     |Directory, Link, Media                     |CryptoKey,        |1.4.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Directory, Link,  |2.4.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Media             |2.6.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.6.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.6.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.6.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |members            |String[Boolean]      |Card              |Section |
   |                   |                     |                  |2.1.6   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |month              |UnsignedInt          |PartialDate       |Section |
   |                   |                     |                  |2.8.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |name               |Name                 |Card              |Section |
   |                   |                     |                  |2.2.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |name               |String               |Author, Nickname,        |Section     | |Sections|
   |                   |                     |Organization, OrgUnit,     |2.8.3,  |
   |                   |                     |Title                    |Section     |
   |                   |                     |                         |2.2.1.3,    |
   |                   |                     |                         |Section     |                     |OrgUnit, Title    |2.2.1.3,|
   |                   |                     |                  |2.2.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.2.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |nicknames          |Id[Nickname]         |Card              |Section |
   |                   |                     |                  |2.2.1.3 |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |note               |String               |Note              |Section |
   |                   |                     |                  |2.8.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |notes              |Id[Note]             |Card              |Section |
   |                   |                     |                  |2.8.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |number             |String               |Phone             |Section |
   |                   |                     |                  |2.3.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |onlineServices     |Id[OnlineService]    |Card              |Section |
   |                   |                     |                  |2.3.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |organizationId     |String               |Title             |Section |
   |                   |                     |                  |2.2.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |organizations      |Id[Organization]     |Card              |Section |
   |                   |                     |                  |2.2.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |personalInfo       |Id[PersonalInfo]     |Card              |Section |
   |                   |                     |                  |2.8.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |phones             |Id[Phone]            |Card              |Section |
   |                   |                     |                  |2.3.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |phonetic           |String               |AddressComponent,        |Section     | |Sections|
   |                   |                     |NameComponent            |2.5.1.2,    |
   |                   |                     |                         |Section     |     |2.5.1.2,|
   |                   |                     |                  |2.2.1.2 |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |phoneticScript     |String               |Address, Name            |Section     |     |Sections|
   |                   |                     |                  |2.2.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.5.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |phoneticSystem     |String               |Address, Name            |Section     |     |Sections|
   |                   |                     |                  |2.2.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.5.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |place              |Address              |Anniversary       |Section |
   |                   |                     |                  |2.8.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |pref               |UnsignedInt          |Address, Calendar,       |Section     | Calendar,|Sections|
   |                   |                     |CryptoKey, Directory,    |1.5.4,        |1.4.4,  |
   |                   |                     |EmailAddress,            |Section                     |Directory,        |1.5.4,  |
   |                   |                     |LanguagePref, Link,                     |EmailAddress,     |2.5.1,  |
   |                   |                     |Media, Nickname,         |Section     |
   |                   |                     |OnlineService, Phone,                     |LanguagePref,     |2.4.1,  |
   |                   |                     |Pronouns,                |Section     |
   |                   |                     |SchedulingAddress                     |Link, Media,      |2.6.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Nickname,         |2.6.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |OnlineService,    |2.3.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |Phone, Pronouns,  |2.3.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |SchedulingAddress |2.6.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.6.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                         |2.2.1.3,    |
   |                   |                     |                         |Section     |                  |2.2.1.3,|
   |                   |                     |                  |2.3.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.3.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.2.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                         |2.4.2,      |
   |                   |                     |                         |Section     |
   |                   |                     |                         |1.4.4                  |2.4.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |preferredLanguages |String[LanguagePref] |Card              |Section |
   |                   |                     |                  |2.3.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |prodId             |String               |Card              |Section |
   |                   |                     |                  |2.1.7   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |pronouns           |Id[Pronouns]         |SpeakToAs         |Section |
   |                   |                     |                  |2.2.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |relatedTo          |String[Relation]     |Card              |Section |
   |                   |                     |                  |2.1.8   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |relation           |String[Boolean]      |Relation          |Section |
   |                   |                     |                  |2.1.8   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |schedulingAddresses|Id[SchedulingAddress]|Card              |Section |
   |                   |                     |                  |2.4.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |service            |String               |OnlineService     |Section |
   |                   |                     |                  |2.3.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |sortAs             |String[String]       |Name              |Section |
   |                   |                     |                  |2.2.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |sortAs             |String               |Organization, OrgUnit     |Section |
   |                   |                     |                     |OrgUnit           |2.2.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |speakToAs          |SpeakToAs            |Card              |Section |
   |                   |                     |                  |2.2.3   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |timeZone           |String               |Address           |Section |
   |                   |                     |                  |2.5.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |titles             |Id[Title]            |Card              |Section |
   |                   |                     |                  |2.2.4   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |uid                |String               |Card              |Section |
   |                   |                     |                  |2.1.9   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |units              |OrgUnit[]            |Organization      |Section |
   |                   |                     |                  |2.2.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |updated            |UTCDateTime          |Card              |Section |
   |                   |                     |                  |2.1.10  |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |uri                |String               |Author, Calendar,        |Section     | |Sections|
   |                   |                     |CryptoKey, Directory,    |2.8.3,      |
   |                   |                     |Link, Media,             |Section     |
   |                   |                     |OnlineService,        |1.4.4,  |
   |                   |                     |SchedulingAddress        |Section     |                     |Directory, Link,  |2.8.3,  |
   |                   |                     |Media,            |2.4.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |OnlineService,    |2.6.1,  |
   |                   |                     |                         |Section     |
   |                   |                     |                     |SchedulingAddress |2.6.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.6.3,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.6.4,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.3.2,  |
   |                   |                     |                         |Section     |
   |                   |                     |                  |2.4.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |user               |String               |OnlineService     |Section |
   |                   |                     |                  |2.3.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |utc                |UTCDateTime          |Timestamp         |Section |
   |                   |                     |                  |2.8.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |value              |String               |AddressComponent,        |Section     | |Sections|
   |                   |                     |NameComponent,    |2.5.1,  |
   |                   |                     |PersonalInfo             |Section     |
   |                   |                     |      |2.2.1,  |
   |                   |                     |                  |2.8.4   |
   +-------------------+---------------------+------------------+--------+
   |version            |String               |Card              |Section |
   |                   |                     |                         |2.8.4                  |2.1.2   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+
   |year               |UnsignedInt          |PartialDate       |Section |
   |                   |                     |                  |2.8.1   |
   +-------------------+---------------------+-------------------------+------------+
   +-------------------+---------------------+------------------+--------+

             Table 2: JSContact Properties with "common" usage Usage

   The following table lists the initial reserved usage entries of the
   "JSContact Properties" registry.  All  For this property, the Change
   Controller is IETF, and the RFC section references are for
   [I-D.ietf-calext-jscontact].  The change controller for all these
   properties reference is IETF.

   +===============+============+============+==============+==========+ for RFC 9553.

   +===============+============+============+=============+==========+
   | Property Name | Property   | Property   | Reference or Reference/  | Intended |
   | Name               | Type       | Context    | Description | Usage    |
   +===============+============+============+==============+==========+
   +===============+============+============+=============+==========+
   | extra         | not        | not        | Section     | reserved |
   |               | applicable | applicable | 1.5.2       |          |
   +---------------+------------+------------+--------------+----------+
   +---------------+------------+------------+-------------+----------+

           Table 3: JSContact Properties with "reserved" usage Usage

3.6.  Creation of the "JSContact Types" JSContact Types Registry

   IANA is asked to create has created the "JSContact Types" registry.  The purpose of this
   new registry is to avoid name collisions for JSContact type names and
   provide a complete reference for all data types used for JSContact
   property values.

   The registry entries sort alphabetically in ascending order by the
   "Type Name" column.  Equal entries sort in any order.

   The registry process for a new type is outlined in Section 3.3.

3.6.1.  "JSContact Types"  JSContact Types Registry Template

   Type Name:  the  The name of the type

   Reference or Description:  a brief description or RFC number and
      section reference where the Type is specified (may be omitted for
      "reserved" type names) type.

   Intended Usage:  common, reserved,  May be "common", "reserved", or obsolete "obsolete".

   Since Version:  This defines the  The JSContact version on which this type definition
      is based on. based.  The version MUST be one of the allowed values of the
      version property in the JSContact "JSContact Enum Value Values" registry (see
      Table 1).

   Until Version:  This defines the  The JSContact version after which this the type definition got obsoleted and
      was obsoleted; therefore, it MUST NOT be used in later versions.
      The Until Version value either MUST NOT be not set, set or MUST be one of
      the allowed values of the version property in the JSContact "JSContact Enum Value
      Values" registry (see Table 1).

   Change Controller:  This is who may request a change to this the entry's
      definition (IETF for RFCs from the IETF stream).

   Reference or Description:  A brief description or RFC number and
      section reference where the Type is specified.  For reserved type
      names, the reference or description MAY be omitted.

3.6.2.  Initial Contents for of the "JSContact Types" JSContact Types Registry

   The following table lists the initial common usage entries of in the
   JSContact Types
   "JSContact Types" registry.  The  For all of these types, the Since
   Version for all types is 1.0.
   The 1.0, the Until Version for all types is not set.  All set, the Change Controller
   is IETF, and RFC section references are for [I-D.ietf-calext-jscontact].  The change
   controller for all these properties is IETF. RFC 9553.

   +===================+==========================+
   | Type Name         | Reference or Description |
   +===================+==========================+
   | Address           | Section 2.5.1            |
   +-------------------+--------------------------+
   | AddressComponent  | Section 2.5.1            |
   +-------------------+--------------------------+
   | Anniversary       | Section 2.8.1            |
   +-------------------+--------------------------+
   | Author            | Section 2.8.3            |
   +-------------------+--------------------------+
   | Boolean           | Section 1.3.2            |
   +-------------------+--------------------------+
   | Calendar          | Section 2.4.1            |
   +-------------------+--------------------------+
   | Card              | Section 2                |
   +-------------------+--------------------------+
   | CryptoKey         | Section 2.6.1            |
   +-------------------+--------------------------+
   | Directory         | Section 2.6.2            |
   +-------------------+--------------------------+
   | EmailAddress      | Section 2.3.1            |
   +-------------------+--------------------------+
   | Id                | Section 1.4.1            |
   +-------------------+--------------------------+
   | Int               | Section 1.4.2            |
   +-------------------+--------------------------+
   | LanguagePref      | Section 2.3.4            |
   +-------------------+--------------------------+
   | Link              | Section 2.6.3            |
   +-------------------+--------------------------+
   | Media             | Section 2.6.4            |
   +-------------------+--------------------------+
   | Name              | Section 2.2.1            |
   +-------------------+--------------------------+
   | NameComponent     | Section 2.2.1            |
   +-------------------+--------------------------+
   | Nickname          | Section 2.2.1.3          |
   +-------------------+--------------------------+
   | Note              | Section 2.8.3            |
   +-------------------+--------------------------+
   | Number            | Section 1.3.2            |
   +-------------------+--------------------------+
   | OnlineService     | Section 2.3.2            |
   +-------------------+--------------------------+
   | Organization      | Section 2.2.2            |
   +-------------------+--------------------------+
   | OrgUnit           | Section 2.2.2            |
   +-------------------+--------------------------+
   | PartialDate       | Section 2.8.1            |
   +-------------------+--------------------------+
   | PatchObject       | Section 1.4.3            |
   +-------------------+--------------------------+
   | PersonalInfo      | Section 2.8.4            |
   +-------------------+--------------------------+
   | Phone             | Section 2.3.3            |
   +-------------------+--------------------------+
   | Pronouns          | Section 2.2.3            |
   +-------------------+--------------------------+
   | Relation          | Section 2.1.8            |
   +-------------------+--------------------------+
   | SchedulingAddress | Section 2.4.2            |
   +-------------------+--------------------------+
   | SpeakToAs         | Section 2.2.3            |
   +-------------------+--------------------------+
   | String            | Section 1.3.2            |
   +-------------------+--------------------------+
   | Timestamp         | Section 2.8.1            |
   +-------------------+--------------------------+
   | Title             | Section 2.2.4            |
   +-------------------+--------------------------+
   | UnsignedInt       | Section 1.4.2            |
   +-------------------+--------------------------+
   | UTCDateTime       | Section 1.4.5            |
   +-------------------+--------------------------+

     Table 4: JSContact Types with "common" usage Usage

   The following table lists the initial reserved usage entries entry of the
   JSContact Types
   "JSContact Types" registry.  All types are for  For this type, the version 1.0.  All is 1.0, the
   Change Controller is IETF, and the RFC section references are for [I-D.ietf-calext-jscontact].  The change
   controller for all these properties reference is IETF. for RFC
   9553.

   +===========+==========================+
   | Type Name | Reference or Description |
   +===========+==========================+
   | Resource  | Section 1.4.4            |
   +-----------+--------------------------+

        Table 5: JSContact Types with
               "reserved" usage Usage

3.7.  Creation of the "JSContact JSContact Enum Values" Values Registry

   IANA is asked to create has created the "JSContact Enum Values" registry.  The purpose
   of the new registry is to allow interoperable extension of semantics
   for JSContact properties with enumerable values.  Each such property
   will have a subregistry of allowed values.

   The registry entries sort alphabetically in ascending order by the
   following columns: "Property Name" column first, "Property Context" second,
   and "Since Version" third.  The enum values sort alphabetically ascending. in
   ascending order.  Equal entries sort in any order.

   The registry process for a new enum value or adding a new enumerable
   property is outlined in Section 3.3.

3.7.1.  "JSContact  JSContact Enum Values" Values Registry Property Template

   This template is for adding a subregistry for a new enumerable
   property to the "JSContact Enum" Enum Values" registry.

   Property Name:  These are the  The name(s) of the property or properties where these
      values may be used.  This MUST be registered in the "JSContact
      Properties" registry.

   Context:  This is the  The list of allowed object types where the property or
      properties may appear, as registered in the "JSContact Properties"
      registry.  This disambiguates where there may be two distinct
      properties with the same name in different contexts.

   Since Version:  This defines the  The JSContact version on which this the enum value
      definition is based on. based.  The version MUST be one of the allowed
      values of the version property in the JSContact "JSContact Enum Value Values"
      registry (see Table 1).

   Until Version:  This defines the  The JSContact version after which this the enum value
      definition was obsoleted; therefore, the enum value definition got obsoleted and
      MUST NOT be used in later versions.  The Until Version value
      either MUST NOT be not set, set or MUST be one of the allowed values of the
      version property in the JSContact "JSContact Enum Value Values" registry (see
      Table 1).

   Change Controller:  This is who may request a change to this the entry's
      definition (IETF for RFCs from the IETF stream).

   Initial Contents:  This is the  The initial list of defined values for
      this the enum,
      using the template defined in Section 3.7.2.  A subregistry will
      be created with these values for this property name/context tuple.

3.7.2.  "JSContact  JSContact Enum Values" Values Registry Value Template

   This template is for adding a new enum value to a subregistry in the
   JSContact
   "JSContact Enum Values" registry.

   Enum Value:  The verbatim value of the enum.

   Reference or Description:  A brief description or RFC number and
      section reference for the semantics of this value.

   Since Version:  The JSContact version on which the enum value
      definition is based on. based.  The version MUST be one of the allowed
      values of the version property in the JSContact "JSContact Enum Value Values"
      registry (see Table 1).

   Until Version:  The JSContact version after which this the enum value was
      obsoleted; therefore, the enum value got
      obsoleted and MUST NOT be used in later
      versions.  The Until Version value either MUST NOT be not set, set or MUST
      be one of the allowed values of the version property in the JSContact
      "JSContact Enum Value Values" registry (see Table 1).

   Reference or Description:  A brief description or RFC number and
      section reference for the semantics of the value.

3.7.3.  Initial Contents for of the "JSContact JSContact Enum Values" Values Registry

   For all entries in each subregistry created in this section, all RFC section
   references are for [I-D.ietf-calext-jscontact].  For all entries, the
   Since Version is 1.0, the Until Version is not set, the Change
   Controller is IETF. IETF, and RFC section references are for RFC 9553.

   Property Name:      contexts
   Context:            Address
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | billing    | Section 2.5.1            |
                       +------------+--------------------------+
                       | delivery   | Section 2.5.1            |
                       +------------+--------------------------+
                       | private    | Section 1.5.1            |
                       +------------+--------------------------+
                       | work       | Section 1.5.1            |
                       +------------+--------------------------+

                           Table 6: JSContact Enum Values for
                              contexts (Context: Address)

   Property Name:      contexts
   Context:            Calendar, CryptoKey, Directory, EmailAddress,
                       LanguagePref, Link, Media, Nickname,
                       OnlineService, Organization, Phone, Pronouns,
                       SchedulingAddress
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | private    | Section 1.5.1            |
                       +------------+--------------------------+
                       | work       | Section 1.5.1            |
                       +------------+--------------------------+

                           Table 7: JSContact Enum Values for
                              contexts (Context: Calendar,
                          CryptoKey, Directory, EmailAddress,
                          LanguagePref, Link, Media, Nickname,
                          OnlineService, Organization, Phone,
                              Pronouns, SchedulingAddress)

   Property Name:      features
   Context:            Phone
   Initial Contents:
                       +=============+==========================+
                       | Enum Value  | Reference or Description |
                       +=============+==========================+
                       | fax         | Section 2.3.3            |
                       +-------------+--------------------------+
                       | main-number | Section 2.3.3            |
                       +-------------+--------------------------+
                       | mobile      | Section 2.3.3            |
                       +-------------+--------------------------+
                       | pager       | Section 2.3.3            |
                       +-------------+--------------------------+
                       | text        | Section 2.3.3            |
                       +-------------+--------------------------+
                       | textphone   | Section 2.3.3            |
                       +-------------+--------------------------+
                       | video       | Section 2.3.3            |
                       +-------------+--------------------------+
                       | voice       | Section 2.3.3            |
                       +-------------+--------------------------+

                           Table 8: JSContact Enum Values for
                               features (Context: Phone)

   Property Name:      grammaticalGender
   Context:            SpeakToAs
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | animate    | Section 2.2.3            |
                       +------------+--------------------------+
                       | common     | Section 2.2.3            |
                       +------------+--------------------------+
                       | feminine   | Section 2.2.3            |
                       +------------+--------------------------+
                       | inanimate  | Section 2.2.3            |
                       +------------+--------------------------+
                       | masculine  | Section 2.2.3            |
                       +------------+--------------------------+
                       | neuter     | Section 2.2.3            |
                       +------------+--------------------------+

                           Table 9: JSContact Enum Values for
                               kind
                              grammaticalGender (Context:
                                       SpeakToAs)

   Property Name:      kind
   Context:            AddressComponent
   Initial Contents:
                       +===============+==========================+
                       | Enum Value    | Reference or Description |
                       +===============+==========================+
                       | apartment     | Section 2.5.1            |
                       +---------------+--------------------------+
                       | block         | Section 2.5.1            |
                       +---------------+--------------------------+
                       | building      | Section 2.5.1            |
                       +---------------+--------------------------+
                       | country       | Section 2.5.1            |
                       +---------------+--------------------------+
                       | direction     | Section 2.5.1            |
                       +---------------+--------------------------+
                       | district      | Section 2.5.1            |
                       +---------------+--------------------------+
                       | floor         | Section 2.5.1            |
                       +---------------+--------------------------+
                       | landmark      | Section 2.5.1            |
                       +---------------+--------------------------+
                       | locality      | Section 2.5.1            |
                       +---------------+--------------------------+
                       | name          | Section 2.5.1            |
                       +---------------+--------------------------+
                       | number        | Section 2.5.1            |
                       +---------------+--------------------------+
                       | postcode      | Section 2.5.1            |
                       +---------------+--------------------------+
                       | postOfficeBox | Section 2.5.1            |
                       +---------------+--------------------------+
                       | region        | Section 2.5.1            |
                       +---------------+--------------------------+
                       | room          | Section 2.5.1            |
                       +---------------+--------------------------+
                       | separator     | Section 2.5.1            |
                       +---------------+--------------------------+
                       | subdistrict   | Section 2.5.1            |
                       +---------------+--------------------------+

                         Table 10: JSContact Enum Values for kind
                               (Context: AddressComponent)

   Property Name:      kind
   Context:            Anniversary
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | birth      | Section 2.8.1            |
                       +------------+--------------------------+
                       | death      | Section 2.8.1            |
                       +------------+--------------------------+
                       | wedding    | Section 2.8.1            |
                       +------------+--------------------------+

                          Table 11: JSContact Enum Values for
                              kind (Context: Anniversary)

   Property Name:      kind
   Context:            Calendar
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | calendar   | Section 2.4.1            |
                       +------------+--------------------------+
                       | freeBusy   | Section 2.4.1            |
                       +------------+--------------------------+

                          Table 12: JSContact Enum Values for
                                kind (Context: Calendar)

   Property Name:      kind
   Context:            Card
   Initial Contents:
                       +=============+==========================+
                       | Enum Value  | Reference or Description |
                       +=============+==========================+
                       | application | Section 2.1.4            |
                       +-------------+--------------------------+
                       | device      | Section 2.1.4            |
                       +-------------+--------------------------+
                       | group       | Section 2.1.4            |
                       +-------------+--------------------------+
                       | individual  | Section 2.1.4            |
                       +-------------+--------------------------+
                       | location    | Section 2.1.4            |
                       +-------------+--------------------------+
                       | org         | Section 2.1.4            |
                       +-------------+--------------------------+

                          Table 13: JSContact Enum Values for
                                  kind (Context: Card)

   Property Name:      kind
   Context:            Directory
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | directory  | Section 2.6.2            |
                       +------------+--------------------------+
                       | entry      | Section 2.6.2            |
                       +------------+--------------------------+

                          Table 14: JSContact Enum Values for
                               kind (Context: Directory)

   Property Name:      kind
   Context:            Link
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | contact    | Section 2.6.3            |
                       +------------+--------------------------+

                          Table 15: JSContact Enum Values for
                                  kind (Context: Link)

   Property Name:      kind
   Context:            Media
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | logo       | Section 2.6.4            |
                       +------------+--------------------------+
                       | photo      | Section 2.6.4            |
                       +------------+--------------------------+
                       | sound      | Section 2.6.4            |
                       +------------+--------------------------+

                          Table 16: JSContact Enum Values for
                                 kind (Context: Media)

   Property Name:      kind
   Context:            NameComponent
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | credential | Section 2.2.1            |
                       +------------+--------------------------+
                       | generation | Section 2.2.1            |
                       +------------+--------------------------+
                       | given      | Section 2.2.1            |
                       +------------+--------------------------+
                       | given2     | Section 2.2.1            |
                       +------------+--------------------------+
                       | separator  | Section 2.2.1            |
                       +------------+--------------------------+
                       | surname    | Section 2.2.1            |
                       +------------+--------------------------+
                       | surname2   | Section 2.2.1            |
                       +------------+--------------------------+
                       | title      | Section 2.2.1            |
                       +------------+--------------------------+

                          Table 17: JSContact Enum Values for
                             kind (Context: NameComponent)

   Property Name:      kind
   Context:            PersonalInfo
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | expertise  | Section 2.8.4            |
                       +------------+--------------------------+
                       | hobby      | Section 2.8.4            |
                       +------------+--------------------------+
                       | interest   | Section 2.8.4            |
                       +------------+--------------------------+

                          Table 18: JSContact Enum Values for
                              kind (Context: PersonalInfo)

   Property Name:      kind
   Context:            Title
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | role       | Section 2.2.4            |
                       +------------+--------------------------+
                       | title      | Section 2.2.4            |
                       +------------+--------------------------+

                          Table 19: JSContact Enum Values for
                                 kind (Context: Title)

   Property Name:      level
   Context:            PersonalInfo
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | high       | Section 2.8.4            |
                       +------------+--------------------------+
                       | low        | Section 2.8.4            |
                       +------------+--------------------------+
                       | medium     | Section 2.8.4            |
                       +------------+--------------------------+

                          Table 20: JSContact Enum Values for
                             level (Context: PersonalInfo)

   Property Name:      phoneticSystem
   Context:            Address, Name
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | ipa        | Section 1.5.5            |
                       +------------+--------------------------+
                       | jyut       | Section 1.5.5            |
                       +------------+--------------------------+
                       | piny       | Section 1.5.5            |
                       +------------+--------------------------+

                          Table 21: JSContact Enum Values for
                           phoneticSystem (Context: Address,
                                         Name)

   Property Name:      relation
   Context:            Relation
   Initial Contents:
                       +==============+==========================+
                       | Enum Value   | Reference or Description |
                       +==============+==========================+
                       | acquaintance | Section 2.1.8            |
                       +--------------+--------------------------+
                       | agent        | Section 2.1.8            |
                       +--------------+--------------------------+
                       | child        | Section 2.1.8            |
                       +--------------+--------------------------+
                       | colleague    | Section 2.1.8            |
                       +--------------+--------------------------+
                       | contact      | Section 2.1.8            |
                       +--------------+--------------------------+
                       | co-resident  | Section 2.1.8            |
                       +--------------+--------------------------+
                       | co-worker    | Section 2.1.8            |
                       +--------------+--------------------------+
                       | crush        | Section 2.1.8            |
                       +--------------+--------------------------+
                       | date         | Section 2.1.8            |
                       +--------------+--------------------------+
                       | emergency    | Section 2.1.8            |
                       +--------------+--------------------------+
                       | friend       | Section 2.1.8            |
                       +--------------+--------------------------+
                       | kin          | Section 2.1.8            |
                       +--------------+--------------------------+
                       | me           | Section 2.1.8            |
                       +--------------+--------------------------+
                       | met          | Section 2.1.8            |
                       +--------------+--------------------------+
                       | muse         | Section 2.1.8            |
                       +--------------+--------------------------+
                       | neighbor     | Section 2.1.8            |
                       +--------------+--------------------------+
                       | parent       | Section 2.1.8            |
                       +--------------+--------------------------+
                       | sibling      | Section 2.1.8            |
                       +--------------+--------------------------+
                       | spouse       | Section 2.1.8            |
                       +--------------+--------------------------+
                       | sweetheart   | Section 2.1.8            |
                       +--------------+--------------------------+

                           Table 21: 22: JSContact Enum Values for
                               relation (Context: Relation)

   Property Name:      phoneticSystem
   Context:            Address, Name
   Initial Contents:
                       +============+==========================+
                       | Enum Value | Reference or Description |
                       +============+==========================+
                       | ipa        | Section 1.5.5            |
                       +------------+--------------------------+
                       | jyut       | Section 1.5.5            |
                       +------------+--------------------------+
                       | piny       | Section 1.5.5            |
                       +------------+--------------------------+

                          Table 22: JSContact Enum Values for
                           phoneticSystem (Context: Address,
                                         Name)

4.  Security Considerations

   Contact information is very privacy-sensitive. privacy sensitive.  It can reveal the
   identity, location and location, credentials information, employment status,
   interests and hobbies, and social network of a user.  Its
   transmission and storage must be done carefully to protect it from
   possible threats, threats such as eavesdropping, replay, message insertion,
   deletion, modification, and on-path attacks.

   The data being stored and transmitted may be used in systems with
   real-world consequences.  For example, a malicious actor might
   provide JSContact data that uses the name of another person but
   insert their contact details to impersonate the unknown victim.  Such
   systems must be careful to authenticate all data they receive to
   prevent them from being subverted and ensure the change comes from an
   authorized entity.

   This document only defines the data format; such considerations are
   primarily the concern of the API or method of storage and
   transmission of such files.

4.1.  JSON Parsing

   The security considerations of [RFC8259] apply to the use of JSON as
   the data interchange format.

   As for any serialization format, parsers need to thoroughly check the
   syntax of the supplied data.  JSON uses opening and closing brackets
   for several types and structures, and it is possible that the end of
   the supplied data will be reached when scanning for a matching
   closing bracket; this is an error condition, and implementations need
   to stop scanning at the end of the supplied data.

   JSON also uses a string encoding with some escape sequences to encode
   special characters within a string.  Care is needed when processing
   these escape sequences to ensure that they are fully formed before
   the special processing is triggered, with special care taken when the
   escape sequences appear adjacent to other (non-escaped) special
   characters or adjacent to the end of data (as in the previous
   paragraph).

   If parsing JSON into a non-textual structured data format,
   implementations may need to allocate storage to hold JSON string
   elements.  Since JSON does not use explicit string lengths, the risk
   of denial of service due to resource exhaustion is small, but
   implementations may still wish to place limits on the size of
   allocations they are willing to make in any given context, to avoid
   untrusted data causing excessive memory allocation.

4.2.  URI Values

   Several JSContact properties contain URIs as values, and processing
   these properties requires extra care.  Section 7 of [RFC3986]
   discusses security risks related to URIs.

   Fetching remote resources carries inherent risks.  Connections must
   only be allowed on well-known ports, using allowed protocols
   (generally, just HTTP/HTTPS on their default ports).  The URL must be
   resolved externally and not allowed to access internal resources.
   Connecting to an external source reveals IP (and therefore often
   location) information.

   A maliciously constructed JSContact object may contain a very large
   number of URIs.  In the case of published address books with a large
   number of subscribers, such objects could be widely distributed.
   Implementations should be careful to limit the automatic fetching of
   linked resources to reduce the risk of this being an amplification
   vector for a denial-of-service attack.

5.  References

5.1.  Normative References

   [IANATZ]   "IANA Time

   [IANA-TZ]  IANA, "Time Zone Database",
              <https://www.iana.org/time-zones>.

   [IANAvCard]
              "IANA vCard

   [IANA-vCard]
              IANA, "vCard Elements", <https://www.iana.org/assignments/
              vcard-elements/vcard-elements.xhtml>.

   [ISO.3166-1.2006]
              <https://www.iana.org/assignments/vcard-elements>.

   [ISO.3166-1]
              International Organization for Standardization, "Codes for
              the representation of names of countries, 3rd edition", countries and their
              subdivisions -- Part 1: Country codes", ISO Standard 3166-1, 2006. 3166-1:2020,
              August 2020.

   [RFC1034]  Mockapetris, P., "Domain names - concepts and facilities",
              STD 13, RFC 1034, DOI 10.17487/RFC1034, November 1987,
              <https://www.rfc-editor.org/info/rfc1034>.

   [RFC1035]  Mockapetris, P., "Domain names - implementation and
              specification", STD 13, RFC 1035, DOI 10.17487/RFC1035,
              November 1987, <https://www.rfc-editor.org/info/rfc1035>.

   [RFC2046]  Freed, N. and N. Borenstein, "Multipurpose Internet Mail
              Extensions (MIME) Part Two: Media Types", RFC 2046,
              DOI 10.17487/RFC2046, November 1996,
              <https://www.rfc-editor.org/info/rfc2046>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC2426]  Dawson, F. and T. Howes, "vCard MIME Directory Profile",
              RFC 2426, DOI 10.17487/RFC2426, September 1998,
              <https://www.rfc-editor.org/info/rfc2426>.

   [RFC3339]  Klyne, G. and C. Newman, "Date and Time on the Internet:
              Timestamps", RFC 3339, DOI 10.17487/RFC3339, July 2002,
              <https://www.rfc-editor.org/info/rfc3339>.

   [RFC4122]  Leach, P., Mealling, M., and R. Salz, "A Universally
              Unique IDentifier (UUID) URN Namespace", RFC 4122,
              DOI 10.17487/RFC4122, July 2005,
              <https://www.rfc-editor.org/info/rfc4122>.

   [RFC4648]  Josefsson, S., "The Base16, Base32, and Base64 Data
              Encodings", RFC 4648, DOI 10.17487/RFC4648, October 2006,
              <https://www.rfc-editor.org/info/rfc4648>.

   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", STD 68, RFC 5234,
              DOI 10.17487/RFC5234, January 2008,
              <https://www.rfc-editor.org/info/rfc5234>.

   [RFC5322]  Resnick, P., Ed., "Internet Message Format", RFC 5322,
              DOI 10.17487/RFC5322, October 2008,
              <https://www.rfc-editor.org/info/rfc5322>.

   [RFC5646]  Phillips, A., Ed. and M. Davis, Ed., "Tags for Identifying
              Languages", BCP 47, RFC 5646, DOI 10.17487/RFC5646,
              September 2009, <https://www.rfc-editor.org/info/rfc5646>.

   [RFC5870]  Mayrhofer, A. and C. Spanring, "A Uniform Resource
              Identifier for Geographic Locations ('geo' URI)",
              RFC 5870, DOI 10.17487/RFC5870, June 2010,
              <https://www.rfc-editor.org/info/rfc5870>.

   [RFC6350]  Perreault, S., "vCard Format Specification", RFC 6350,
              DOI 10.17487/RFC6350, August 2011,
              <https://www.rfc-editor.org/info/rfc6350>.

   [RFC6901]  Bryan, P., Ed., Zyp, K., and M. Nottingham, Ed.,
              "JavaScript Object Notation (JSON) Pointer", RFC 6901,
              DOI 10.17487/RFC6901, April 2013,
              <https://www.rfc-editor.org/info/rfc6901>.

   [RFC7493]  Bray, T., Ed., "The I-JSON Message Format", RFC 7493,
              DOI 10.17487/RFC7493, March 2015,
              <https://www.rfc-editor.org/info/rfc7493>.

   [RFC7529]  Daboo, C. and G. Yakushev, "Non-Gregorian Recurrence Rules
              in the Internet Calendaring and Scheduling Core Object
              Specification (iCalendar)", RFC 7529,
              DOI 10.17487/RFC7529, May 2015,
              <https://www.rfc-editor.org/info/rfc7529>.

   [RFC8126]  Cotton, M., Leiba, B., and T. Narten, "Guidelines for
              Writing an IANA Considerations Section in RFCs", BCP 26,
              RFC 8126, DOI 10.17487/RFC8126, June 2017,
              <https://www.rfc-editor.org/info/rfc8126>.

   [RFC8141]  Saint-Andre, P. and J. Klensin, "Uniform Resource Names
              (URNs)", RFC 8141, DOI 10.17487/RFC8141, April 2017,
              <https://www.rfc-editor.org/info/rfc8141>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8259]  Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
              Interchange Format", STD 90, RFC 8259,
              DOI 10.17487/RFC8259, December 2017,
              <https://www.rfc-editor.org/info/rfc8259>.

5.2.  Informative References
   [I-D.ietf-calext-jscontact]
              Stepanek, R. and M. Loffredo, "JSContact: A JSON
              representation of contact data", Work in Progress,
              September 2023, <https://datatracker.ietf.org/doc/html/
              draft-ietf-calext-jscontact-15>.

   [I-D.ietf-uuidrev-rfc4122bis]
              Davis, K. R., Peabody, B., and P. Leach, "Universally
              Unique IDentifiers (UUID)", Work in Progress, Internet-
              Draft, draft-ietf-uuidrev-rfc4122bis-14, 6 November 2023,
              <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-
              rfc4122bis-14>.

   [IPA]      IPA, "International Phonetic Alphabet",
              <https://www.internationalphoneticalphabet.org/>.

   [RFC3261]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
              A., Peterson, J., Sparks, R., Handley, M., and E.
              Schooler, "SIP: Session Initiation Protocol", RFC 3261,
              DOI 10.17487/RFC3261, June 2002,
              <https://www.rfc-editor.org/info/rfc3261>.

   [RFC3966]  Schulzrinne, H., "The tel URI for Telephone Numbers",
              RFC 3966, DOI 10.17487/RFC3966, December 2004,
              <https://www.rfc-editor.org/info/rfc3966>.

   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax", STD 66,
              RFC 3986, DOI 10.17487/RFC3986, January 2005,
              <https://www.rfc-editor.org/info/rfc3986>.

   [RFC3987]  Duerst, M. and M. Suignard, "Internationalized Resource
              Identifiers (IRIs)", RFC 3987, DOI 10.17487/RFC3987,
              January 2005, <https://www.rfc-editor.org/info/rfc3987>.

   [RFC6351]  Perreault, S., "xCard: vCard XML Representation",
              RFC 6351, DOI 10.17487/RFC6351, August 2011,
              <https://www.rfc-editor.org/info/rfc6351>.

   [RFC6473]  Saint-Andre, P., "vCard KIND:application", RFC 6473,
              DOI 10.17487/RFC6473, December 2011,
              <https://www.rfc-editor.org/info/rfc6473>.

   [RFC6474]  Li, K. and B. Leiba, "vCard Format Extensions: Place of
              Birth, Place and Date of Death", RFC 6474,
              DOI 10.17487/RFC6474, December 2011,
              <https://www.rfc-editor.org/info/rfc6474>.

   [RFC6715]  Cauchie, D., Leiba, B., and K. Li, "vCard Format
              Extensions: Representing vCard Extensions Defined by the
              Open Mobile Alliance (OMA) Converged Address Book (CAB)
              Group", RFC 6715, DOI 10.17487/RFC6715, August 2012,
              <https://www.rfc-editor.org/info/rfc6715>.

   [RFC6869]  Salgueiro, G., Clarke, J., and P. Saint-Andre, "vCard
              KIND:device", RFC 6869, DOI 10.17487/RFC6869, February
              2013, <https://www.rfc-editor.org/info/rfc6869>.

   [RFC7095]  Kewisch, P., "jCard: The JSON Format for vCard", RFC 7095,
              DOI 10.17487/RFC7095, January 2014,
              <https://www.rfc-editor.org/info/rfc7095>.

   [RFC8499]  Hoffman, P., Sullivan, A., and K. Fujiwara, "DNS
              Terminology", BCP 219, RFC 8499, DOI 10.17487/RFC8499,
              January 2019, <https://www.rfc-editor.org/info/rfc8499>.

   [RFC8605]  Hollenbeck, S. and R. Carney, "vCard Format Extensions:
              ICANN Extensions for the Registration Data Access Protocol
              (RDAP)", RFC 8605, DOI 10.17487/RFC8605, May 2019,
              <https://www.rfc-editor.org/info/rfc8605>.

   [UBiDi]    "Unicode®    The Unicode Consortium, "Unicode Standard Annex #9:
              Unicode Bidirectional Algorithm", Revision 48,
              Unicode 15.1.0, August 2023,
              <https://www.unicode.org/reports/tr9/>.

   [W3C-URL]  "W3C WG URL -

   [UUID]     Davis, K. R., Peabody, B. G., and P. Leach, "Universally
              Unique IDentifiers (UUID)", Work in Progress, Internet-
              Draft, draft-ietf-uuidrev-rfc4122bis-14, 6 November 2023,
              <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-
              rfc4122bis-14>.

   [WHATWG-URL]
              WHATWG, "URL Living Standard — Last Updated 21 August
              2023", Standard", January 2024,
              <https://url.spec.whatwg.org>.

Authors' Addresses

   Robert Stepanek
   Fastmail
   PO Box 234, 234
   Collins St St. West
   Melbourne VIC 8007
   Australia
   Email: rsto@fastmailteam.com

   Mario Loffredo
   IIT-CNR
   Via Moruzzi,1 Moruzzi, 1
   56124 Pisa
   Italy
   Email: mario.loffredo@iit.cnr.it