SIMPLE WG                                                  J. Urpalainen
Internet-Draft                                     Nokia Research Center
Expires: January 16, 2006                                  July 15, 2005


              Combined Presence Schemas Utilizing RELAX NG
              draft-urpalainen-simple-presence-relaxng-00

Status of this Memo

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   This Internet-Draft will expire on January 16, 2006.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This memo describes a batch of Presence Information Data Format
   (PIDF) and its extension schemas written with the RELAX NG schema
   language.  With the current W3C XML Schema language it is impossible
   to write forward and backward compatible presence combination schemas
   because of lacking versioning support.  These RELAX NG combination
   schemas are stricter than the W3C Schemas and thus the instance
   documents that validate with these schemas follow the intended
   content model more closely.  Especially, these schemas are targeted
   to actual implementations in order to decrease interoperability



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   problems.

Table of Contents

   1.   Introduction . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.   Conventions  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.   Overview of the Presence RELAX NG Schemas  . . . . . . . . .   4
   4.   PIDF schema  . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.   DataModel schema . . . . . . . . . . . . . . . . . . . . . .   8
   6.   RPID schema  . . . . . . . . . . . . . . . . . . . . . . . .  11
   7.   CIPID schema . . . . . . . . . . . . . . . . . . . . . . . .  29
   8.   Devcaps schema . . . . . . . . . . . . . . . . . . . . . . .  31
   9.   Servcaps schema  . . . . . . . . . . . . . . . . . . . . . .  34
   10.  An example instance document . . . . . . . . . . . . . . . .  44
   11.  Security considerations  . . . . . . . . . . . . . . . . . .  47
   12.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . .  47
   13.  References . . . . . . . . . . . . . . . . . . . . . . . . .  47
     13.1   Normative references . . . . . . . . . . . . . . . . . .  47
     13.2   Informative references . . . . . . . . . . . . . . . . .  48
        Author's Address . . . . . . . . . . . . . . . . . . . . . .  48
        Intellectual Property and Copyright Statements . . . . . . .  50






























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1.  Introduction

   Within a Common Presence Profile (CPP) [13] compatible presence
   system presence data is represented using the Extensible Markup
   Language (XML) [2] based Presence Information Data Format (PIDF) [8].
   The PIDF format describes the baseline of the instance documents and
   currently many extensions to it are being described: e.g.  DataModel
   [9], RPID [10], CIPID [11] and CAPS [12].

   The content model of these XML documents is described primarily by
   the W3C XML Schemas [5].  While the W3C XML Schema language has an
   extensive amount of impressive properties, for example the versioning
   support is still lacking.  That is, it is impossible write forward
   and backward compatible schemas because of the "Unique Particle
   Attribution" constraint described in Appendix H of the recommendation
   [5] and because wildcard definitions aren't flexible enough.
   Therefore, all the presence extension documents can not extend PIDF
   so that e.g. positions for the new elements could be defined within
   the extension schema so that wildcard definitions would still exist.
   The W3C XML Schema Working Group is going to fix this versioning
   issue in the upcoming 1.1 version.  Until that happens
   implementations can utilize RELAX NG [7] for validations of presence
   documents once relevant RELAX NG schemas exist.  This memo describes
   a batch of these schemas which try to be as compatible as possible
   with the current presence W3C XML schemas.  The set includes schemas
   for PIDF, DataModel, RPID, CIPID and CAPS.  As these schemas are more
   restrictive than the corresponding W3C XML Schemas, if instance
   documents validate according to these schemas they should also
   validate with the W3C XML Schemas too.

   While it might be tempting to start a dispute whether IETF/SIMPLE
   should adopt the RELAX NG schemas over the W3C XML Schemas, the
   purpose is just to produce a reasonable set of schemas which can be
   used in real implementations, i.e. to decrease interoperability
   problems.  Also full comparisons of these tools are out of the scope
   of this document.  Currently RELAX NG just fits better for this
   purpose where a reasonable combination of schemas is required, i.e.
   the positioning of extensions while retaining wildcard definitions
   can easily be done.

2.  Conventions

   In this document, the key words "MUST", "MUST NOT", "REQUIRED",
   "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY",
   and "OPTIONAL" are to be interpreted as described in RFC 2119 [1] and
   indicate requirement levels for compliant implementations.

   The following terms are used in this document:



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   Forward and backward compatible schema: Backwards compatibility means
      that existing instance documents can be used also by updated new
      consumers and forwards compatibility means that newer instance
      documents can also be used by existing consumers.

   Ambiguous schema: A schema is said to be ambiguous when a document
      may be valid when its contents match multiple different pattern
      alternatives.

   Deterministic schema: At each point, when matching an instance
      document against a schema, the schema processor has at most one
      possible choice.

   Wildcards in schemas: In W3C XML Schemas <any> and <anyAttribute>
      definitions are wildcards.  They can be used to provide
      extensibility to the XML instance documents.  RELAX NG provides a
      very versatile though somewhat verbose model for wildcards with
      <anyName> and <except> rules.


3.  Overview of the Presence RELAX NG Schemas

   All schemas written with the RELAX NG schema language are based on
   patterns.  The W3C Schema datatypes [6] are used to constrain the
   element and attribute content in these schemas.

   The model for these schemas is based on the chronological order of
   appearance of these schemas, i.e. the PIDF schema is the baseline
   schema and the DataModel schema includes it by adding some
   extensions.  Then the RPID schema includes the DataModel schema and
   defines all the extensions, etc.  When an implementation wants to
   validate an instance document it just has to provide a single schema
   e.g. a RPID reference to the validator as that schema will include
   all the others.  This ordering is somewhat arbitrary as many of these
   extensions are at this stage "work-in-progress".

   Extension points, i.e. where <any> wildcards are used in W3C XML
   Schemas, are described by adding two definitions to these schemas: an
   extension definition with <empty> content and a wildcard definition.
   The former is added because it is then easy to extend that point by
   using combine="interleave" rule.  The wildcard definition must be
   redefined in extension schemas if deterministic schemas are required.
   The schemas presented in this memo are deterministic and unambiguous
   although it is not a general requirement of the RELAX NG schema
   language.

   The ability to easily redefine extension points helps when an
   application does not have any extensions beyond e.g.  RPID and



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   DataModel:


   <?xml version="1.0"?>
   <grammar xmlns="http://relaxng.org/ns/structure/1.0">

     <include href="rpid.rng">

       <!-- rule out extensions -->
       <define name="anyRPID">
         <empty/>
       </define>

       <define name="anyOtherAttr">
         <empty/>
       </define>

     </include>
   </grammar>


   Without touching the PIDF, DataModel or RPID schemas all the wildcard
   extensions have been practically removed.  Similarly, if "rpid.rng"
   is replaced with "devcaps.rng" and "anyRPID" with "anyCaps" the
   combined schema will rule out all the wildcard extensions while
   retaining the other element and attribute definitions within the
   PIDF, DataModel, RPID, CIPID and CAPS schemas.  This would be a more
   important feature if wildcards in these RELAX NG schemas were
   strictly aligned with the W3C Schema versions, i.e. if they would
   fully follow the "##other" namespace rule.  However, it was not
   considered worth the effort to define all those different wildcard
   definitions but instead use this conservative and simple
   deterministic model where wildcard except rules are redefined by just
   adding new <nsName> namespace definitions onto the <except> list.

4.  PIDF schema

   The RELAX NG version of the PIDF [8] schema.  Hereafter it is called
   with "pidf.rng" as if it were represented as an equivalent filesystem
   object.


   <?xml version="1.0"?>
   <grammar xmlns="http://relaxng.org/ns/structure/1.0"
     ns="urn:ietf:params:xml:ns:pidf"
     datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">

     <start>



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       <element name="presence">
         <attribute name="entity">
           <data type="anyURI"/>
         </attribute>
         <zeroOrMore>
           <element name="tuple">
             <attribute name="id">
               <data type="ID"/>
             </attribute>

             <element name="status">
               <optional>
                 <element name="basic">
                   <choice>
                     <value type="string">open</value>
                     <value type="string">closed</value>
                   </choice>
                 </element>
               </optional>

               <zeroOrMore>
                 <ref name="StatusExtension"/>
               </zeroOrMore>

               <zeroOrMore>
                 <ref name="anyPIDF"/>
               </zeroOrMore>
             </element>

             <zeroOrMore>
               <ref name="TupleExtension"/>
             </zeroOrMore>

             <zeroOrMore>
               <ref name="anyPIDF"/>
             </zeroOrMore>

             <optional>
               <element name="contact">
                 <optional>
                   <attribute name="priority">
                     <data type="decimal">
                       <param name="pattern"
                        >0(.[0-9]{0,3})?|1(.0{0,3})?</param>
                     </data>
                   </attribute>
                 </optional>
                 <data type="anyURI"/>



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               </element>
             </optional>

             <zeroOrMore>
               <ref name="note"/>
             </zeroOrMore>

             <optional>
               <element name="timestamp">
                 <data type="dateTime"/>
               </element>
             </optional>
           </element>
         </zeroOrMore>

         <zeroOrMore>
           <ref name="note"/>
         </zeroOrMore>

         <zeroOrMore>
           <ref name="PresenceExtension"/>
         </zeroOrMore>

         <zeroOrMore>
           <ref name="anyPIDF"/>
         </zeroOrMore>
       </element>
     </start>

     <!-- extension point with interleave for presence -->
     <define name="PresenceExtension">
       <empty/>
     </define>

     <!-- extension point with interleave for status -->
     <define name="StatusExtension">
       <empty/>
     </define>

     <!-- extension point with interleave for tuple -->
     <define name="TupleExtension">
       <empty/>
     </define>

     <!-- wildcard for other than pidf namespace -->
     <define name="anyPIDF">
       <element>
         <anyName>



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           <except>
             <nsName ns="urn:ietf:params:xml:ns:pidf"/>
             <nsName ns=""/>
           </except>
         </anyName>
         <mixed>
           <zeroOrMore>
             <choice>
               <attribute>
                 <anyName/>
               </attribute>
               <ref name="anyPIDF"/>
             </choice>
           </zeroOrMore>
         </mixed>
       </element>
     </define>

     <!-- note -->
     <define name="note">
       <element name="note">
         <optional>
           <attribute>
             <name ns="http://www.w3.org/XML/1998/namespace">lang</name>
             <data type="language"/>
           </attribute>
         </optional>
         <data type="string"/>
       </element>
     </define>
   </grammar>


   This is the only schema that defines a document root element.  The
   "anyPIDF" wildcard definition rules out elements from the PIDF
   namespace and also elements that don't have any namespace attached.
   The "PresenceExtension", "StatusExtension" and "TupleExtension"
   definitions are empty extension points which can be used with
   combine="interleave" references within the extension schemas.

5.  DataModel schema

   The RELAX NG version of the DataModel [9] schema, "data-model.rng":


   <?xml version="1.0"?>
   <grammar xmlns="http://relaxng.org/ns/structure/1.0"
     ns="urn:ietf:params:xml:ns:pidf:data-model"



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     datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">

     <!-- include PIDF and redefine wildcard -->
     <include href="pidf.rng">

       <!-- rule out data-model+pidf namespace -->
       <define name="anyPIDF">
         <ref name="anyDataModel"/>
       </define>

     </include>

     <!-- presence extension definition -->
     <define name="PresenceExtension" combine="interleave">
       <interleave>
         <optional>
           <element name="device">
             <attribute name="id">
               <data type="ID"/>
             </attribute>

             <ref name="deviceIDDataModel"/>

             <optional>
               <ref name="noteDataModel"/>
             </optional>

             <optional>
               <ref name="timestampDataModel"/>
             </optional>

             <zeroOrMore>
               <ref name="DeviceExtension"/>
             </zeroOrMore>

             <zeroOrMore>
               <ref name="anyDataModel"/>
             </zeroOrMore>
           </element>
         </optional>

         <optional>
           <element name="person">
             <attribute name="id">
               <data type="ID"/>
             </attribute>

             <optional>



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               <ref name="noteDataModel"/>
             </optional>

             <optional>
               <ref name="timestampDataModel"/>
             </optional>

             <zeroOrMore>
               <ref name="PersonExtension"/>
             </zeroOrMore>

             <zeroOrMore>
               <ref name="anyDataModel"/>
             </zeroOrMore>
           </element>
         </optional>
       </interleave>
     </define>

     <!-- tuple extension definition -->
     <define name="TupleExtension" combine="interleave">
       <optional>
         <ref name="deviceIDDataModel"/>
       </optional>
     </define>

     <!-- extension point with interleave for person element -->
     <define name="PersonExtension">
       <empty/>
     </define>

     <!-- extension point with interleave for device element -->
     <define name="DeviceExtension">
       <empty/>
     </define>

     <!-- wildcarcd from other than
          pidf and data-model namespaces -->
     <define name="anyDataModel">
       <element>
         <anyName>
           <except>
             <nsName ns="urn:ietf:params:xml:ns:pidf:data-model"/>
             <nsName ns="urn:ietf:params:xml:ns:pidf"/>
             <nsName ns=""/>
           </except>
         </anyName>
         <mixed>



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           <zeroOrMore>
             <choice>
               <attribute>
                 <anyName/>
               </attribute>
               <ref name="anyDataModel"/>
             </choice>
           </zeroOrMore>
         </mixed>
       </element>
     </define>

     <!-- note -->
     <define name="noteDataModel">
       <element name="note">
         <optional>
           <attribute>
             <name ns="http://www.w3.org/XML/1998/namespace">lang</name>
             <data type="language"/>
           </attribute>
         </optional>
         <data type="string"/>
       </element>
     </define>

     <!-- deviceID -->
     <define name="deviceIDDataModel">
       <element name="deviceID">
         <data type="anyURI"/>
       </element>
     </define>

     <!-- timestamp -->
     <define name="timestampDataModel">
       <element name="timestamp">
         <data type="dateTime"/>
       </element>
     </define>
   </grammar>

   The DataModel schema includes "pidf.rng" and the "anyPIDF" wildcard
   definition is redefined with "anyDataModel".  The "PersonExtension"
   and "DeviceExtension" definitions are empty extension points.

6.  RPID schema

   The RELAX NG version of the RPID [10] schema, "rpid.rng":




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   <?xml version="1.0"?>
   <grammar xmlns="http://relaxng.org/ns/structure/1.0"
     ns="urn:ietf:params:xml:ns:pidf:rpid"
     datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">

     <include href="data-model.rng">

       <!-- rule out data-model+pidf+rpid namespace -->
       <define name="anyDataModel">
         <ref name="anyRPID"/>
       </define>

     </include>

     <!-- person extension definition -->
     <define name="PersonExtension" combine="interleave">
       <ref name="PersonRPID"/>
     </define>

     <!-- device extension definition -->
     <define name="DeviceExtension" combine="interleave">
       <ref name="DeviceRPID"/>
     </define>

     <!-- tuple extension definition -->
     <define name="TupleExtension" combine="interleave">
       <ref name="TupleRPID"/>
     </define>

     <!-- wildcarcd from other than
          pidf, data-model and rpid namespace -->
     <define name="anyRPID">
       <element>
         <anyName>
           <except>
             <nsName ns="urn:ietf:params:xml:ns:pidf:rpid"/>
             <nsName ns="urn:ietf:params:xml:ns:pidf:data-model"/>
             <nsName ns="urn:ietf:params:xml:ns:pidf"/>
             <nsName ns=""/>
           </except>
         </anyName>
         <mixed>
           <zeroOrMore>
             <choice>
               <attribute>
                 <anyName/>
               </attribute>
               <ref name="anyRPID"/>



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             </choice>
           </zeroOrMore>
         </mixed>
       </element>
     </define>

     <!-- person extension -->
     <define name="PersonRPID">
       <interleave>
         <optional>
           <ref name="activities"/>
         </optional>
         <optional>
           <ref name="class"/>
         </optional>
         <optional>
           <ref name="mood"/>
         </optional>
         <optional>
           <ref name="place-is"/>
         </optional>
         <optional>
           <ref name="place-type"/>
         </optional>
         <optional>
           <ref name="privacy"/>
         </optional>
         <optional>
           <ref name="sphere"/>
         </optional>
         <optional>
           <ref name="status-icon"/>
         </optional>
         <optional>
           <ref name="time-offset"/>
         </optional>
         <optional>
           <ref name="user-input"/>
         </optional>
       </interleave>
     </define>

     <!-- tuple extension -->
     <define name="TupleRPID">
       <interleave>
         <optional>
           <ref name="class"/>
         </optional>



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         <optional>
           <ref name="privacy"/>
         </optional>
         <optional>
           <ref name="relationship"/>
         </optional>
         <optional>
           <ref name="service-class"/>
         </optional>
         <optional>
           <ref name="status-icon"/>
         </optional>
         <optional>
           <ref name="user-input"/>
         </optional>
       </interleave>
     </define>

     <!-- device extension -->
     <define name="DeviceRPID">
       <interleave>
         <optional>
           <ref name="class"/>
         </optional>
         <optional>
           <ref name="user-input"/>
         </optional>
       </interleave>
     </define>

     <!-- activities -->
     <define name="activities">
       <element name="activities">
         <optional>
           <element name="note">
             <ref name="noteRPID"/>
           </element>
         </optional>
         <choice>
           <element name="unknown">
             <ref name="anyType"/>
           </element>
           <group>
             <interleave>
               <optional>
                 <element name="appointment"><empty/></element>
               </optional>
               <optional>



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                 <element name="away"><empty/></element>
               </optional>
               <optional>
                 <element name="breakfast"><empty/></element>
               </optional>
               <optional>
                 <element name="busy"><empty/></element>
               </optional>
               <optional>
                 <element name="dinner"><empty/></element>
               </optional>
               <optional>
                 <element name="holiday"><empty/></element>
               </optional>
               <optional>
                 <element name="in-transit"><empty/></element>
               </optional>
               <optional>
                 <element name="meal"><empty/></element>
               </optional>
               <optional>
                 <element name="meeting"><empty/></element>
               </optional>
               <optional>
                 <element name="on-the-phone"><empty/></element>
               </optional>
               <optional>
                 <element name="performance"><empty/></element>
               </optional>
               <optional>
                 <element name="permanent-absence"><empty/></element>
               </optional>
               <optional>
                 <element name="playing"><empty/></element>
               </optional>
               <optional>
                 <element name="presentation"><empty/></element>
               </optional>
               <optional>
                 <element name="sleeping"><empty/></element>
               </optional>
               <optional>
                 <element name="spectator"><empty/></element>
               </optional>
               <optional>
                 <element name="steering"><empty/></element>
               </optional>
               <optional>



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                 <element name="travel"><empty/></element>
               </optional>
               <optional>
                 <element name="tv"><empty/></element>
               </optional>
               <optional>
                 <element name="vacation"><empty/></element>
               </optional>
               <optional>
                 <element name="working"><empty/></element>
               </optional>
               <optional>
                 <element name="other">
                   <ref name="noteRPID"/>
                 </element>
               </optional>
             </interleave>
             <zeroOrMore>
               <ref name="ActivitiesExtension"/>
             </zeroOrMore>
             <zeroOrMore>
               <ref name="anyRPID"/>
             </zeroOrMore>
           </group>
         </choice>

         <ref name="commonAttributes"/>

       </element>
     </define>

     <!-- defining common attributes in several elements -->
     <define name="commonAttributes">
       <ref name="fromUntil"/>

       <optional>
         <attribute name="id">
           <data type="ID"/>
         </attribute>
       </optional>

       <zeroOrMore>
         <ref name="anyOtherAttr"/>
       </zeroOrMore>
     </define>

     <!-- any attributes except already defined ones -->
     <define name="anyOtherAttr">



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       <attribute>
         <anyName>
         <except>
           <name ns="">from</name>
           <name ns="">until</name>
           <name ns="">id</name>
         </except>
         </anyName>
       </attribute>
     </define>

     <!-- activities extension point -->
     <define name="ActivitiesExtension">
       <empty/>
     </define>

     <!-- class -->
     <define name="class">
       <element name="class">
         <data type="token"/>
       </element>
     </define>

     <!-- mood -->
     <define name="mood">
       <element name="mood">
         <optional>
           <element name="note">
             <ref name="noteRPID"/>
           </element>
         </optional>
         <choice>
           <element name="unknown">
             <ref name="anyType"/>
           </element>
           <group>
             <interleave>
               <optional>
                 <element name="afraid"><empty/></element>
               </optional>
               <optional>
                 <element name="amazed"><empty/></element>
               </optional>
               <optional>
                 <element name="angry"><empty/></element>
               </optional>
               <optional>
                 <element name="annoyed"><empty/></element>



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               </optional>
               <optional>
                 <element name="anxious"><empty/></element>
               </optional>
               <optional>
                 <element name="ashamed"><empty/></element>
               </optional>
               <optional>
                 <element name="bored"><empty/></element>
               </optional>
               <optional>
                 <element name="brave"><empty/></element>
               </optional>
               <optional>
                 <element name="calm"><empty/></element>
               </optional>
               <optional>
                 <element name="cold"><empty/></element>
               </optional>
               <optional>
                 <element name="confused"><empty/></element>
               </optional>
               <optional>
                 <element name="contented"><empty/></element>
               </optional>
               <optional>
                 <element name="cranky"><empty/></element>
               </optional>
               <optional>
                 <element name="curious"><empty/></element>
               </optional>
               <optional>
                 <element name="depressed"><empty/></element>
               </optional>
               <optional>
                 <element name="disappointed"><empty/></element>
               </optional>
               <optional>
                 <element name="disgusted"><empty/></element>
               </optional>
               <optional>
                 <element name="distracted"><empty/></element>
               </optional>
               <optional>
                 <element name="embarrassed"><empty/></element>
               </optional>
               <optional>
                 <element name="excited"><empty/></element>



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               </optional>
               <optional>
                 <element name="flirtatious"><empty/></element>
               </optional>
               <optional>
                 <element name="frustrated"><empty/></element>
               </optional>
               <optional>
                 <element name="grumpy"><empty/></element>
               </optional>
               <optional>
                 <element name="guilty"><empty/></element>
               </optional>
               <optional>
                 <element name="happy"><empty/></element>
               </optional>
               <optional>
                 <element name="hot"><empty/></element>
               </optional>
               <optional>
                 <element name="humbled"><empty/></element>
               </optional>
               <optional>
                 <element name="humiliated"><empty/></element>
               </optional>
               <optional>
                 <element name="hungry"><empty/></element>
               </optional>
               <optional>
                 <element name="hurt"><empty/></element>
               </optional>
               <optional>
                 <element name="impressed"><empty/></element>
               </optional>
               <optional>
                 <element name="in_awe"><empty/></element>
               </optional>
               <optional>
                 <element name="in_love"><empty/></element>
               </optional>
               <optional>
                 <element name="indignant"><empty/></element>
               </optional>
               <optional>
                 <element name="interested"><empty/></element>
               </optional>
               <optional>
                 <element name="invincible"><empty/></element>



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               </optional>
               <optional>
                 <element name="jealous"><empty/></element>
               </optional>
               <optional>
                 <element name="lonely"><empty/></element>
               </optional>
               <optional>
                 <element name="mean"><empty/></element>
               </optional>
               <optional>
                 <element name="moody"><empty/></element>
               </optional>
               <optional>
                 <element name="nervous"><empty/></element>
               </optional>
               <optional>
                 <element name="neutral"><empty/></element>
               </optional>
               <optional>
                 <element name="offended"><empty/></element>
               </optional>
               <optional>
                 <element name="playful"><empty/></element>
               </optional>
               <optional>
                 <element name="proud"><empty/></element>
               </optional>
               <optional>
                 <element name="relieved"><empty/></element>
               </optional>
               <optional>
                 <element name="remorseful"><empty/></element>
               </optional>
               <optional>
                 <element name="sad"><empty/></element>
               </optional>
               <optional>
                 <element name="sarcastic"><empty/></element>
               </optional>
               <optional>
                 <element name="serious"><empty/></element>
               </optional>
               <optional>
                 <element name="shocked"><empty/></element>
               </optional>
               <optional>
                 <element name="shy"><empty/></element>



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               </optional>
               <optional>
                 <element name="sick"><empty/></element>
               </optional>
               <optional>
                 <element name="sleepy"><empty/></element>
               </optional>
               <optional>
                 <element name="stressed"><empty/></element>
               </optional>
               <optional>
                 <element name="surprised"><empty/></element>
               </optional>
               <optional>
                 <element name="thirsty"><empty/></element>
               </optional>
               <optional>
                 <element name="worried"><empty/></element>
               </optional>
               <optional>
                 <element name="other">
                   <ref name="noteRPID"/>
                 </element>
               </optional>

             </interleave>
             <zeroOrMore>
               <ref name="MoodExtension"/>
             </zeroOrMore>
             <zeroOrMore>
               <ref name="anyRPID"/>
             </zeroOrMore>
           </group>
         </choice>

         <ref name="commonAttributes"/>

       </element>
     </define>

     <!-- mood extension point -->
     <define name="MoodExtension">
       <empty/>
     </define>

     <!-- place-is -->
     <define name="place-is">
       <element name="place-is">



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         <optional>
           <element name="note">
             <ref name="noteRPID"/>
           </element>
         </optional>
         <optional>
           <element name="audio">
             <choice>
               <element name="noisy"><empty/></element>
               <element name="ok"><empty/></element>
               <element name="quiet"><empty/></element>
               <element name="unknown"><empty/></element>
             </choice>
           </element>
         </optional>
         <optional>
           <element name="video">
             <choice>
               <element name="toobright"><empty/></element>
               <element name="ok"><empty/></element>
               <element name="dark"><empty/></element>
               <element name="unknown"><empty/></element>
             </choice>
           </element>
         </optional>
         <optional>
           <element name="text">
             <choice>
               <element name="uncomfortable"><empty/></element>
               <element name="inappropriate"><empty/></element>
               <element name="ok"><empty/></element>
               <element name="unknown"><empty/></element>
             </choice>
           </element>
         </optional>

         <ref name="commonAttributes"/>

       </element>
     </define>

     <!-- place-type -->
     <define name="place-type">
       <element name="place-type">
         <optional>
           <element name="note">
             <ref name="noteRPID"/>
           </element>



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         </optional>
         <choice>
           <element name="aircraft"><empty/></element>
           <element name="airport"><empty/></element>
           <element name="bar"><empty/></element>
           <element name="club"><empty/></element>
           <element name="bus"><empty/></element>
           <element name="cafe"><empty/></element>
           <element name="car"><empty/></element>
           <element name="classroom"><empty/></element>
           <element name="convention_center"><empty/></element>
           <element name="cycle"><empty/></element>
           <element name="home"><empty/></element>
           <element name="hospital"><empty/></element>
           <element name="hotel"><empty/></element>
           <element name="industrial"><empty/></element>
           <element name="library"><empty/></element>
           <element name="mall"><empty/></element>
           <element name="office"><empty/></element>
           <element name="outdoors"><empty/></element>
           <element name="place-of-warship"><empty/></element>
           <element name="prison"><empty/></element>
           <element name="public"><empty/></element>
           <element name="public-transport"><empty/></element>
           <element name="restaurant"><empty/></element>
           <element name="school"><empty/></element>
           <element name="ship"><empty/></element>
           <element name="station"><empty/></element>
           <element name="street"><empty/></element>
           <element name="theater"><empty/></element>
           <element name="train"><empty/></element>
           <element name="truck"><empty/></element>
           <element name="underway"><empty/></element>
           <element name="unknown"><empty/></element>
           <element name="other">
             <ref name="noteRPID"/>
           </element>
           <oneOrMore>
             <ref name="PlaceTypeExtension"/>
           </oneOrMore>
           <oneOrMore>
             <ref name="anyRPID"/>
           </oneOrMore>
         </choice>

         <ref name="commonAttributes"/>

       </element>



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     </define>

     <!-- place-type extension point -->
     <define name="PlaceTypeExtension">
       <empty/>
     </define>

     <!-- privacy -->
     <define name="privacy">
       <element name="privacy">
         <optional>
           <element name="note">
             <ref name="noteRPID"/>
           </element>
         </optional>
         <choice>
           <element name="unknown">
             <ref name="anyType"/>
           </element>
           <group>
             <optional>
               <element name="audio"><empty/></element>
             </optional>
             <optional>
               <element name="text"><empty/></element>
             </optional>
             <optional>
               <element name="video"><empty/></element>
             </optional>
             <zeroOrMore>
               <ref name="PrivacyExtension"/>
             </zeroOrMore>
             <zeroOrMore>
               <ref name="anyRPID"/>
             </zeroOrMore>
           </group>
         </choice>

         <ref name="commonAttributes"/>

       </element>
     </define>

     <!-- privacy extension point -->
     <define name="PrivacyExtension">
       <empty/>
     </define>




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     <!-- relationship -->
     <define name="relationship">
       <element name="relationship">
         <optional>
           <element name="note">
             <ref name="noteRPID"/>
           </element>
         </optional>
         <choice>
           <element name="assistant"><empty/></element>
           <element name="associate"><empty/></element>
           <element name="family"><empty/></element>
           <element name="friend"><empty/></element>
           <element name="self"><empty/></element>
           <element name="supervisor"><empty/></element>
           <element name="unknown"><empty/></element>
           <oneOrMore>
             <ref name="RelationshipExtension"/>
           </oneOrMore>
           <oneOrMore>
             <ref name="anyRPID"/>
           </oneOrMore>
         </choice>
       </element>
     </define>

     <!-- relationship extension point -->
     <define name="RelationshipExtension">
       <empty/>
     </define>

     <!-- service-class -->
     <define name="service-class">
       <element name="service-class">
         <optional>
           <element name="note">
             <ref name="noteRPID"/>
           </element>
         </optional>
         <choice>
           <element name="delivery"><empty/></element>
           <element name="electronic"><empty/></element>
           <element name="in-person"><empty/></element>
           <element name="postal"><empty/></element>
           <element name="supervisor"><empty/></element>
           <element name="unknown"><empty/></element>
           <oneOrMore>
             <ref name="ServiceClassExtension"/>



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           </oneOrMore>
           <oneOrMore>
             <ref name="anyRPID"/>
           </oneOrMore>
         </choice>
       </element>
     </define>

     <!-- service-class extension point -->
     <define name="ServiceClassExtension">
       <empty/>
     </define>

     <!-- sphere -->
     <define name="sphere">
       <element name="sphere">
         <mixed>
           <optional>
             <choice>
               <element name="home"><empty/></element>
               <element name="work"><empty/></element>
               <element name="unknown"><empty/></element>
               <zeroOrMore>
                 <ref name="SphereExtension"/>
               </zeroOrMore>
               <zeroOrMore>
                 <ref name="anyRPID"/>
               </zeroOrMore>
             </choice>
           </optional>

           <ref name="commonAttributes"/>
         </mixed>
       </element>
     </define>

     <!-- sphere extension point -->
     <define name="SphereExtension">
       <empty/>
     </define>

     <!-- status-icon -->
     <define name="status-icon">
       <element name="status-icon">
         <data type="anyURI"/>

         <ref name="commonAttributes"/>
       </element>



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     </define>

     <!-- time-offset -->
     <define name="time-offset">
       <element name="time-offset">
         <data type="integer"/>

         <ref name="fromUntil"/>

         <optional>
           <attribute name="description"/>
         </optional>

         <optional>
           <attribute name="id">
             <data type="ID"/>
           </attribute>
         </optional>

         <zeroOrMore>
           <attribute>
             <anyName>
               <except>
                 <name ns="">description</name>
                 <name ns="">from</name>
                 <name ns="">until</name>
                 <name ns="">id</name>
               </except>
             </anyName>
           </attribute>
         </zeroOrMore>

       </element>
     </define>

     <!-- user-input -->
     <define name="user-input">
       <element name="user-input">
         <optional>
           <attribute name="idle-threshold">
             <data type="positiveInteger"/>
           </attribute>
         </optional>

         <optional>
           <attribute name="last-input">
             <data type="dateTime"/>
           </attribute>



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         </optional>

         <optional>
           <attribute name="id">
             <data type="ID"/>
           </attribute>
         </optional>

         <choice>
           <value type="string">active</value>
           <value type="string">idle</value>
         </choice>

         <zeroOrMore>
           <attribute>
             <anyName>
               <except>
                 <name ns="">idle-threshold</name>
                 <name ns="">last-input</name>
                 <name ns="">id</name>
               </except>
             </anyName>
           </attribute>
         </zeroOrMore>
       </element>
     </define>

     <!-- any type -->
     <define name="anyType">
       <zeroOrMore>
         <choice>
           <element>
             <anyName/>
             <ref name="anyType"/>
           </element>
           <attribute>
             <anyName/>
           </attribute>
           <text/>
         </choice>
       </zeroOrMore>
     </define>

     <!-- fromUntil attributes -->
     <define name="fromUntil">
       <optional>
         <attribute name="from">
           <data type="dateTime"/>



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         </attribute>
       </optional>
       <optional>
         <attribute name="until">
           <data type="dateTime"/>
         </attribute>
       </optional>
     </define>

     <!-- noteRPID element content -->
     <define name="noteRPID">
       <optional>
         <attribute>
           <name ns="http://www.w3.org/XML/1998/namespace">lang</name>
           <data type="language"/>
         </attribute>
       </optional>
       <data type="string"/>
     </define>
   </grammar>

   The RPID schema includes "data-model.rng" and the "anyDataModel"
   wildcard definition is redefined with "anyRPID".  There are many
   XXX"Extension" definitions.

7.  CIPID schema

   The RELAX NG version of the CIPID [11] schema, "cipid.rng":


   <?xml version="1.0"?>
   <grammar xmlns="http://relaxng.org/ns/structure/1.0"
     ns="urn:ietf:params:xml:ns:pidf:cipid"
     datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">

     <!-- include RPID and refine wildcard -->
     <include href="rpid.rng">

       <!-- rule out data-model+pidf+rpid+cipid namespace -->
       <define name="anyRPID">
         <ref name="anyCIPID"/>
       </define>

     </include>

     <!-- person extension definition -->
     <define name="PersonExtension" combine="interleave">
       <ref name="CIPID"/>



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     </define>

     <!-- tuple extension definition -->
     <define name="TupleExtension" combine="interleave">
       <ref name="CIPID"/>
     </define>

     <!-- wildcarcd from other than
          pidf, data-model, rpid and cipid namespaces -->
     <define name="anyCIPID">
       <element>
         <anyName>
           <except>
             <nsName ns="urn:ietf:params:xml:ns:pidf:cipid"/>
             <nsName ns="urn:ietf:params:xml:ns:pidf:rpid"/>
             <nsName ns="urn:ietf:params:xml:ns:pidf:data-model"/>
             <nsName ns="urn:ietf:params:xml:ns:pidf"/>
             <nsName ns=""/>
           </except>
         </anyName>
         <mixed>
           <zeroOrMore>
             <choice>
               <attribute>
                 <anyName/>
               </attribute>
               <ref name="anyCIPID"/>
             </choice>
           </zeroOrMore>
         </mixed>
       </element>
     </define>

     <!-- CIPID extension -->
     <define name="CIPID">
       <interleave>
         <optional>
           <element name="card">
             <data type="anyURI"/>
           </element>
         </optional>
         <optional>
           <element name="display-name">
             <data type="string"/>
           </element>
         </optional>
         <optional>
           <element name="icon">



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             <data type="anyURI"/>
           </element>
         </optional>
         <optional>
           <element name="homepage">
             <data type="anyURI"/>
           </element>
         </optional>
         <optional>
           <element name="sound">
             <data type="anyURI"/>
           </element>
         </optional>
         <optional>
           <element name="map">
             <data type="anyURI"/>
           </element>
         </optional>
       </interleave>
     </define>

   </grammar>

   The CIPID schema includes "rpid.rng" and the "anyRPID" wildcard
   definition is redefined with "anyCIPID".

8.  Devcaps schema

   The RELAX NG version of the Devcaps [12] schema, "devcaps.rng":


   <?xml version="1.0"?>
   <grammar xmlns="http://relaxng.org/ns/structure/1.0"
     ns="urn:ietf:params:xml:ns:pidf:caps"
     datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">

     <!-- include CIPID and redefine wildcard -->
     <include href="cipid.rng">

       <!-- rule out data-model+pidf+rpid+cipid+caps namespace -->
       <define name="anyCIPID">
         <ref name="anyCaps"/>
       </define>

     </include>

     <!-- include also Servcaps definitions -->
     <include href="servcaps.rng"/>



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     <!-- person extension definition -->
     <define name="DeviceExtension" combine="interleave">
       <ref name="devcaps"/>
     </define>

     <!-- wildcarcd from other than
          pidf, data-model, rpid, cipid and caps namespaces -->
     <define name="anyCaps">
       <element>
         <anyName>
           <except>
             <nsName ns="urn:ietf:params:xml:ns:pidf:caps"/>
             <nsName ns="urn:ietf:params:xml:ns:pidf:cipid"/>
             <nsName ns="urn:ietf:params:xml:ns:pidf:rpid"/>
             <nsName ns="urn:ietf:params:xml:ns:pidf:data-model"/>
             <nsName ns="urn:ietf:params:xml:ns:pidf"/>
             <nsName ns=""/>
           </except>
         </anyName>
         <mixed>
           <zeroOrMore>
             <choice>
               <attribute>
                 <anyName/>
               </attribute>
               <ref name="anyCaps"/>
             </choice>
           </zeroOrMore>
         </mixed>
       </element>
     </define>

     <!-- devcaps -->
     <define name="devcaps">
       <optional>
         <element name="devcaps">
           <optional>
             <element name="description">
               <data type="string"/>
             </element>
           </optional>
           <optional>
             <element name="mobility">
               <optional>
                 <element name="supported">
                   <ref name="mobilitytypes"/>
                 </element>
               </optional>



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               <optional>
                 <element name="notsupported">
                   <ref name="mobilitytypes"/>
                 </element>
               </optional>
             </element>
           </optional>
           <optional>
             <element name="priority">
               <optional>
                 <element name="supported">
                   <ref name="prioritytypes"/>
                 </element>
               </optional>
               <optional>
                 <element name="notsupported">
                   <ref name="prioritytypes"/>
                 </element>
               </optional>
             </element>
           </optional>
           <zeroOrMore>
             <ref name="anyCaps"/>
           </zeroOrMore>
         </element>
       </optional>
     </define>

     <!-- prioritytypes -->
     <define name="prioritytypes">
       <zeroOrMore>
         <element name="equals">
           <attribute name="value">
             <data type="integer"/>
           </attribute>
         </element>
       </zeroOrMore>

       <zeroOrMore>
         <element name="higherhan">
           <attribute name="minvalue">
             <data type="integer"/>
           </attribute>
         </element>
       </zeroOrMore>

       <zeroOrMore>
         <element name="lowerthan">



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           <attribute name="maxvalue">
             <data type="integer"/>
           </attribute>
         </element>
       </zeroOrMore>

       <zeroOrMore>
         <element name="range">
           <attribute name="maxvalue">
             <data type="integer"/>
           </attribute>
           <attribute name="minvalue">
             <data type="integer"/>
           </attribute>
         </element>
       </zeroOrMore>
       <zeroOrMore>
         <ref name="anyCaps"/>
       </zeroOrMore>
     </define>

     <!-- mobilitytypes -->
     <define name="mobilitytypes">
       <optional>
         <element name="fixed">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="mobile">
           <data type="string"/>
         </element>
       </optional>
       <zeroOrMore>
         <ref name="anyCaps"/>
       </zeroOrMore>
     </define>
   </grammar>

   The Devcaps schema includes "cipid.rng" and "servcaps.rng".  The
   "anyCIPID" wildcard definition is redefined with "anyCaps".

9.  Servcaps schema

   The RELAX NG version of the Servcaps [12] schema, "servcaps.rng":


   <?xml version="1.0"?>



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   <grammar xmlns="http://relaxng.org/ns/structure/1.0"
     ns="urn:ietf:params:xml:ns:pidf:caps"
     datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">

     <!-- person extension definition -->
     <define name="TupleExtension" combine="interleave">
       <ref name="servcaps"/>
     </define>

     <!-- servcaps -->
     <define name="servcaps">
       <optional>
         <element name="servcaps">
           <optional>
             <element name="actor">
               <optional>
                 <element name="supported">
                   <ref name="actortypes"/>
                 </element>
               </optional>
               <optional>
                 <element name="notsupported">
                   <ref name="actortypes"/>
                 </element>
               </optional>
             </element>
           </optional>
           <optional>
             <element name="application">
               <data type="boolean"/>
             </element>
           </optional>
           <optional>
             <element name="audio">
               <data type="boolean"/>
             </element>
           </optional>
           <optional>
             <element name="automata">
               <data type="boolean"/>
             </element>
           </optional>
           <optional>
             <element name="class">
               <optional>
                 <element name="supported">
                   <ref name="classtypes"/>
                 </element>



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               </optional>
               <optional>
                 <element name="notsupported">
                   <ref name="classtypes"/>
                 </element>
               </optional>
             </element>
           </optional>
           <optional>
             <element name="control">
               <data type="boolean"/>
             </element>
           </optional>
           <optional>
             <element name="data">
               <data type="boolean"/>
             </element>
           </optional>
           <optional>
             <element name="description">
               <data type="string"/>
             </element>
           </optional>
           <optional>
             <element name="duplex">
               <optional>
                 <element name="supported">
                   <ref name="duplextypes"/>
                 </element>
               </optional>
               <optional>
                 <element name="notsupported">
                   <ref name="duplextypes"/>
                 </element>
               </optional>
             </element>
           </optional>
           <optional>
             <element name="extensions">
               <optional>
                 <element name="supported">
                   <ref name="extensiontypes"/>
                 </element>
               </optional>
               <optional>
                 <element name="notsupported">
                   <ref name="extensiontypes"/>
                 </element>



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               </optional>
             </element>
           </optional>
           <optional>
             <element name="event-packages">
               <optional>
                 <element name="supported">
                   <ref name="eventtypes"/>
                 </element>
               </optional>
               <optional>
                 <element name="notsupported">
                   <ref name="eventtypes"/>
                 </element>
               </optional>
             </element>
           </optional>
           <optional>
             <element name="isfocus">
               <data type="boolean"/>
             </element>
           </optional>
           <optional>
             <element name="message">
               <data type="boolean"/>
             </element>
           </optional>
           <optional>
             <element name="methods">
               <optional>
                 <element name="supported">
                   <ref name="methodtypes"/>
                 </element>
               </optional>
               <optional>
                 <element name="notsupported">
                   <ref name="methodtypes"/>
                 </element>
               </optional>
             </element>
           </optional>
           <optional>
             <element name="languages">
               <optional>
                 <element name="supported">
                   <oneOrMore>
                     <element name="l">
                       <data type="string"/>



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                     </element>
                   </oneOrMore>
                 </element>
               </optional>
               <optional>
                 <element name="notsupported">
                   <oneOrMore>
                     <element name="l">
                       <data type="string"/>
                     </element>
                   </oneOrMore>
                 </element>
               </optional>
             </element>
           </optional>
           <optional>
             <element name="priority">
               <optional>
                 <element name="supported">
                   <ref name="prioritytypes"/>
                 </element>
               </optional>
               <optional>
                 <element name="notsupported">
                   <ref name="prioritytypes"/>
                 </element>
               </optional>
             </element>
           </optional>
           <optional>
             <element name="schemes">
               <optional>
                 <element name="supported">
                   <oneOrMore>
                     <element name="s">
                       <data type="string"/>
                     </element>
                   </oneOrMore>
                 </element>
               </optional>
               <optional>
                 <element name="notsupported">
                   <oneOrMore>
                     <element name="s">
                       <data type="string"/>
                     </element>
                   </oneOrMore>
                 </element>



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               </optional>
             </element>
           </optional>
           <optional>
             <element name="text">
               <data type="boolean"/>
             </element>
           </optional>
           <zeroOrMore>
             <element name="type">
               <data type="string"/>
             </element>
           </zeroOrMore>
           <optional>
             <element name="video">
               <data type="boolean"/>
             </element>
           </optional>
           <zeroOrMore>
             <ref name="anyCaps"/>
           </zeroOrMore>
         </element>
       </optional>
     </define>

     <!-- duplextypes -->
     <define name="duplextypes">
       <optional>
         <element name="full">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="half">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="receive-only">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="send-only">
           <data type="string"/>
         </element>
       </optional>
       <zeroOrMore>



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         <ref name="anyCaps"/>
       </zeroOrMore>
     </define>

     <!-- eventtypes -->
     <define name="eventtypes">
       <optional>
         <element name="message-summary">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="presence">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="refer">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="reg">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="Siemens-RTP-Stats">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="spirits-INDPs">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="spirits-user-prof">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="winfo">
           <data type="string"/>
         </element>
       </optional>
       <zeroOrMore>
         <ref name="anyCaps"/>



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       </zeroOrMore>
     </define>

     <!-- extensiontypes -->
     <define name="extensiontypes">
       <optional>
         <element name="rel100">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="join">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="path">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="precondition">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="pref">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="privacy">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="replaces">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="sec-agree">
           <data type="string"/>
         </element>
       </optional>
       <zeroOrMore>
         <ref name="anyCaps"/>
       </zeroOrMore>



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     </define>

     <!-- classtypes -->
     <define name="classtypes">
       <optional>
         <element name="business">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="personal">
           <data type="string"/>
         </element>
       </optional>
       <zeroOrMore>
         <ref name="anyCaps"/>
       </zeroOrMore>
     </define>

     <!-- actortypes -->
     <define name="actortypes">
       <optional>
         <element name="attendant">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="information">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="msg-taker">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="principal">
           <data type="string"/>
         </element>
       </optional>
       <zeroOrMore>
         <ref name="anyCaps"/>
       </zeroOrMore>
     </define>

     <!-- methodtypes -->
     <define name="methodtypes">



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       <optional>
         <element name="ACK">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="BYE">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="CANCEL">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="INFO">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="INVITE">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="MESSAGE">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="NOTIFY">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="OPTIONS">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="PRACK">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="PUBLISH">
           <data type="string"/>



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         </element>
       </optional>
       <optional>
         <element name="REFER">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="REGISTER">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="SUBSCRIBE">
           <data type="string"/>
         </element>
       </optional>
       <optional>
         <element name="UPDATE">
           <data type="string"/>
         </element>
       </optional>
       <zeroOrMore>
         <ref name="anyCaps"/>
       </zeroOrMore>
     </define>
   </grammar>

   This Servcaps schema was included by "devcaps.rng".

10.  An example instance document

   An example instance document:


   <?xml version="1.0" encoding="UTF-8"?>
   <presence xmlns="urn:ietf:params:xml:ns:pidf"
     xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model"
     xmlns:rpid="urn:ietf:params:xml:ns:pidf:rpid"
     xmlns:c="urn:ietf:params:xml:ns:pidf:cipid"
     xmlns:caps="urn:ietf:params:xml:ns:pidf:caps"
     entity="pres:someone@example.com">

     <tuple id="bs35r9">
       <status>
         <basic>open</basic>
       </status>
       <dm:deviceID>urn:device:0003ba4811e3</dm:deviceID>



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       <rpid:relationship><rpid:self/></rpid:relationship>
       <rpid:service-class><rpid:electronic/></rpid:service-class>
       <caps:servcaps>
         <caps:audio>true</caps:audio>
         <caps:description>
              Example service
         </caps:description>
         <caps:duplex>
           <caps:supported>
             <caps:full/>
           </caps:supported>
         </caps:duplex>
         <caps:message>true</caps:message>
         <caps:methods>
           <caps:supported>
             <caps:ACK/>
             <caps:BYE/>
             <caps:INVITE/>
           </caps:supported>
         </caps:methods>
         <caps:priority>
           <caps:supported>
             <caps:lowerthan maxvalue="10"/>
           </caps:supported>
         </caps:priority>
         <caps:schemes>
           <caps:supported>
             <caps:s>sip</caps:s>
           </caps:supported>
         </caps:schemes>
         <caps:video>false</caps:video>
       </caps:servcaps>
       <contact priority="0.8">im:someone@mobile.example.net</contact>
       <note xml:lang="en">Don't Disturb Please!</note>
       <note xml:lang="fr">Ne derangez pas, s'il vous plait</note>
       <timestamp>2001-10-27T16:49:29Z</timestamp>
     </tuple>

     <tuple id="ty4658">
       <status>
         <basic>open</basic>
       </status>
       <rpid:relationship><rpid:assistant/></rpid:relationship>
       <contact priority="1.0">mailto:secretary@example.com</contact>
     </tuple>

     <tuple id="eg92n8">
       <status>



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         <basic>open</basic>
       </status>
       <dm:deviceID>urn:x-mac:0003ba4811e3</dm:deviceID>
       <rpid:class>email</rpid:class>
       <rpid:service-class><rpid:electronic/></rpid:service-class>
       <rpid:status-icon
             >http://www.example.com/mailbox.png</rpid:status-icon>
       <contact priority="1.0">mailto:someone@example.com</contact>
     </tuple>

     <note>I'll be in Tokyo next week</note>

     <dm:device id="pc147">
       <dm:deviceID>urn:device:0003ba4811e3</dm:deviceID>
       <dm:note>PC</dm:note>
       <rpid:user-input idle-threshold="600"
         last-input="2004-10-21T13:20:00.000-05:00"
         >idle</rpid:user-input>
       <caps:devcaps>
         <caps:mobility>
           <caps:supported>
             <caps:mobile/>
           </caps:supported>
         </caps:mobility>
       </caps:devcaps>
     </dm:device>

     <dm:person id="p1">
       <dm:timestamp>2005-05-30T16:09:44+05:00</dm:timestamp>
       <rpid:activities
          from="2005-05-30T12:00:00+05:00"
          until="2005-05-30T17:00:00+05:00">
          <rpid:note>Far away</rpid:note>
          <rpid:away/>
       </rpid:activities>
       <rpid:class>calendar</rpid:class>
       <rpid:mood><rpid:angry/></rpid:mood>
       <rpid:place-is>
          <rpid:audio>
             <rpid:noisy/>
          </rpid:audio>
       </rpid:place-is>
       <rpid:place-type><rpid:home/></rpid:place-type>
       <rpid:privacy><rpid:unknown/></rpid:privacy>
       <rpid:sphere>bowling league</rpid:sphere>
       <rpid:status-icon
             >http://www.example.com/playing.gif</rpid:status-icon>
       <rpid:time-offset>-240</rpid:time-offset>



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       <c:card>http://example.com/~someone/card.vcd</c:card>
       <c:homepage>http://example.com/~someone</c:homepage>
       <c:icon>http://example.com/~someone/icon.gif</c:icon>
       <c:map>http://example.com/~someone/gml-map.xml</c:map>
       <c:sound>http://example.com/~someone/whoosh.wav</c:sound>

     </dm:person>
   </presence>

   This instance document can be validated with the described PIDF,
   PIDF+DataModel, PIDF+DataModel+RPID, PIDF+DataModel+RPID+CIPID or
   PIDF+DataModel+RPID+CIPID+CAPS schemas.  The wildcard definitions can
   be disabled when using the CAPS schema as there are no "private"
   extensions.  Likewise a simple basic PIDF instance document can be
   validated with all of these schema combinations.  This shows how
   forward and backward compatible schemas work in practice, only the
   level of scrutiny changes.

   It is worth noting that the ordering of the extension child elements
   of the <tuple> element can interchange.  This applies to the <person>
   element extensions as well.  The "interleave" definition allows
   unordered content.

11.  Security considerations

   Information transported within these documents can be highly
   sensitive.  All the security considerations described in PIDF and
   extension documents applies to this as well.

12.  Acknowledgments

   The author would like to thank Aki Niemi, Pekka Pessi and Eva-Maria
   Leppanen for their valuable comments.

13.  References

13.1  Normative references

   [1]   Bradner, S., "Key words for use in RFCs to Indicate Requirement
         Levels", BCP 14, RFC 2119, March 1997.

   [2]   "Extensible Markup Language (XML) 1.0 (Third Edition)", W3C
         Recommendation REC-xml-20040204 , February 2004.

   [3]   "Canonical XML 1.0", W3C Recommendation REC-xml-c14n-20010315 ,
         March 2001.

   [4]   "Namespaces in XML", W3C Recommendation REC-xml-names-



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         19990114 , January 1999.

   [5]   "XML Schema Part 1: Structures Second Edition", W3C
         Recommendation REC-xmlschema-1-20041028 , October 2004.

   [6]   "XML Schema Part 2: Datatypes Second Edition", W3C
         Recommendation REC-xmlschema-2-20041028 , October 2004.

   [7]   "RELAX NG Specification", Committee Specification 3 ,
         December 2001.

   [8]   Sugano, H., "CPIM presence information data format", RFC 3863,
         May 2003.

   [9]   Rosenberg, J., "A Data Model for Presence",
          draft-ietf-simple-presence-data-model-02 (work in progress),
         February 2005.

   [10]  Schulzrinne, H., Gurbani, V., Kyzivat, P., and J. Rosenberg,
         "RPID: Rich Presence Extensions to the Presence Information
         Data Format (PIDF)",  draft-ietf-simple-rpid-07 (work in
         progress), June 2005.

   [11]  Schulzrinne, H., "CIPID: Contact Information in Presence
         Information Data Format",  draft-ietf-simple-cipid-05 (work in
         progress), June 2005.

   [12]  Lonnfors, M. and K. Kiss, "User Agent Capability Extension to
         Presence Information Data Format (PIDF)",
          draft-ietf-simple-prescaps-ext-04 (work in progress),
         June 2005.

13.2  Informative references

   [13]  Peterson, J., "Common Profile for Presence (CPP)", RFC 3859,
         August 2004.















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Author's Address

   Jari Urpalainen
   Nokia Research Center
   Itamerenkatu 11-13
   Helsinki  00180
   Finland

   Phone: +358 7180 37686
   Email: jari.urpalainen@nokia.com









































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