Versions: 03 Network Working Group C. Reed Internet-Draft OGC Intended status: Informational June 8, 2011 Expires: Dec 9, 2011 URN Namespace for the Defence Geospatial Information Working Group (DGIWG) draft-reed-urn-dgiwg-03 Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on July 9, 2011. Copyright Notice Copyright (c) 2011 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Reed Expires Dec 9, 2011 [Page 1] Internet-Draft URN DGIWG Namespace January 2011 Abstract This document describes the Namespace Identifier (NID) for Uniform Resource Namespace (URN) resources published by the Defence Geospatial Information Working Group (DGIWG). DGIWG defines and manages resources that utilize this URN name model. Management activities for these and other resource types are provided by the Defence Geospatial Information Working Group (DGIWG) Registry System (DRS). For the processes that DGIWG uses to manage this and other registries, see the DGIWG Concept of Operations. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. URN Specification for "dgiwg" NID . . . . . . . . . . . . . . .4 3. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4. Namespace Considerations . . . . . . . . . . . . . . . . . . . 6 5. Community Considerations . . . . . . . . . . . . . . . . . . . 6 6. Security Considerations . . . . . . . . . . . . . . . . . . . . 7 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7 8. Informative References . . . . . . . . . . . . . . . . . . . . 7 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 7 Reed Expires Dec 9, 2011 [Page 2] Internet-Draft URN dgiwg Namespace June 2011 1. Introduction The DGIWG is a multi-national body responsible to the Defence organizations of member nations for coordinated advice and policy recommendations on standards and practices for geospatial information and support services. The DGIWG creates standards and recommended practices required to enable the provision, exchange and exploit geospatial information. It supports the requirements of NATO and the other alliances that its member nations participate in, including UN sanctioned peace keeping. The DGIWG has and continues to define standards, processes and procedures for the use of international standards in the DGIWG community. The DGIWG geospatial standards are built upon the generic and abstract standards for geographic information defined by the International Organization for Standardization (ISO TC/211). The DGIWG makes use of the service specifications endorsed by the Open Geospatial Consortium (OGC). The DGIWG defines information components for use in the development of product specifications and application schemas for military geospatial data. The DGIWG also establishes service specifications, encoding formats and testing methodologies to meet military geospatial intelligence requirements. Some of the solutions being developed by the DGIWG need XML namespaces that are managed so that they are unique and persistent. To assure that the uniqueness is absolute, the registration of a specific Namespace ID (NID) for use by the DGIWG was deemed appropriate. Therefore, a full and complete registration will follow the namespace specification process as defined in [RFC3406]. Reed Expires Dec 9, 2011 [Page 3] Internet-Draft URN dgiwg Namespace June 2011 2. URN Specification for "dgiwg" NID Namespace ID: dgiwg Registration Information: registration version number: 1 registration date: YYYY-MM-DD [RFC Editor, please replace with the date of publication of this RFC] Declared registrant of the namespace: Registering organization: Defence Geospatial Information Working Group Name: The Secretary (attn: Mr Paul Burton) Address: Defence Geospatial Information Working Group (DGIWG) UK Hydrographic Office Admiralty Way, TAUNTON Somerset TA1 2DN United Kingdom Designated contact: Role: The DGIWG Registry Services Administrator Email: dgiwg-urn-admin@dgiwg.org Declaration of syntactic structure: The Namespace Specific String (NSS) of all URNs that use the "dgiwg" NID will have the following structure: urn:dgiwg:{DGIWGresource}:{ResourceSpecificString} where the "DGIWGresource" is a US-ASCII string that conforms to the URN syntax requirements [RFC2141] and defines a specific class of resource type. Each resource type has a specific labeling scheme that is covered by "ResourceSpecificString", which also conforms to the naming requirements of [RFC2141]. The only exception is that the character ":" shall not be used as part of the "DGIWGResource" string. This is to avoid possible confusion. Further, "DGIWGResource" is case sensitive. The DGIWG maintains a naming authority, the DGIWG Registration System (DRS) that will manage the assignment of "DGIWGresources" and the specific registration values assigned for each resource class. Other DGIWG Standards documents will define the "ResourceSpecificStrings" for a given "DGIWG resource". Reed Expires Dec 9, 2011 [Page 4] Internet-Draft URN dgiwg Namespace June 2011 Relevant ancillary documentation: The DGIWG defines a number of specific lists of information elements that can be combined with the models in product specifications and application schema. These are maintained by the DGIWG. More information about the DRS and the registration activities and procedures to be followed can be found in the document "Concept of Operations for Registration", which provides the procedures for the DGIWG registration of geographical items. https://portal.dgiwg.org/files/?artifact_id=5438&format=doc. This is a stable URI. Additional information may be found at http://www.dgiwg.org/dgiwg/htm/registers/registers.htm Identifier uniqueness considerations: The DRS will manage resources using the "dgiwg" NID and will be the authority for managing the resource type identifiers and subsequent strings associated with them. In the associated procedures, the DRS will ensure the uniqueness of the strings or shall permit secondary responsibility for management of well defined sub-trees. URNs issued by the DRS may not be reassigned The DGIWG may permit use of experimental type values that will not be registered. As a consequence, multiple users may end up using the same value for separate uses. As experimental usage is only intended for testing purposes, this should not be a real issue. Identifier persistence considerations: The DRS will provide clear documentation of the registered uses of the "dgiwg" NID. The DRS will establish a registry for DGIWGresources. Each DGIWGresource will have a separate description in the registry and may have its own sub-registry. The registries and information will be published and maintained by the DRS on its web site. Process of identifier assignment: As defined in the DGIWG Concept of Operations for Registration, the DRS will provide procedures for registration of each type of Resource that it maintains. Each such resource may have three types of registration activities: 1. Registered values associated with DGIWG specifications or services 2. Registration of values or sub-registries to other entities 3. Name models for use in experimental purposes Reed Expires Dec 9, 2011 [Page 5] Internet-Draft URN dgiwg Namespace June 2011 Process for identifier resolution: The namespace is not listed with an RDS; this is not relevant. Rules for Lexical Equivalence: No special considerations; the rules for lexical equivalence of [RFC2141] apply. Conformance with URN Syntax: No special considerations. Validation mechanism: None specified. URN assignment will be handled by procedures implemented in support of DRS activities. Scope: Global 3. Examples The following examples are representative urns that could be assigned by the DRS. They may not be the actual strings that would be assigned. Example 1 DGIWGresource "crs" Syntax: "urn:dgiwg:crs:" ResourceSpecificString: simple string with name of the coordinate reference system defined in a sub-registry Use: Defines the urn to be used for queries to a DGIWG crs registry that provides URIs for crs. Example 2 DGIWGresource "dfdd" Syntax: "urn:dgiwg:fad:dfdd:" The DGIWG maintains a feature and attribute data (FAD) registry that contains registers of geographic information concepts used to characterize aspects of real world phenomena for different information communities. (https://www.dgiwg.org/FAD/registers.jsp) Reed Expires Dec 9, 2011 [Page 6] Internet-Draft URN DGIWG Namespace June 2011 urn:dgiwg:fad:dfdd:Aerodrome:aerodrome urn:dgiwg:fad:dfdd:Helipad:helipad urn:dgiwg:fad:dfdd:AerodromeMoveAreaLighting:aerodrome movement-area-lighting 4. Namespace Considerations The Defence Geospatial Information Working Group is developing a variety of applications and services. Some of these services require that supporting information (e.g., data descriptions, attributes, etc.) be fully specified. For proper operation, descriptions of the needed supporting information must exist and be available in a unique, reliable, and persistent manner. These dependencies provide the basis of need for namespaces, in one form or another. As the work is ongoing and the Defence Geospatial Information Working Group covers many technical areas, the possibility of binding to various other namespace repositories has been deemed impractical. Each object or description, as defined by the DGIWG, could possibly be related to multiple different other namespaces, so further conflicts of association could occur. Thus the intent is to utilize the Defence Geospatial Information Working Group Registration System, operated by the DGIWG, as the naming authority for DGIWG defined objects and descriptions. 5. Community Considerations The objects and descriptions required for registration services defined by the DGIWG are publicly available for use by other organizations. The DGIWG will provide public access and support for name requests by other organizations. This support can be enabled in a timely and responsive fashion as new objects and descriptions are produced. These will be enabled in a fashion similar to current IANA processes. A description of the DGIWG collaboration process is available on the DGIWG website http://www.dgiwg.org/dgiwg/ . Due to DGIWG coordination with other standards organizations and the Use of standards from other standards organizations, there is a need to avoid duplicate or replicated names, such as those for coordinate reference systems. In order to coordinate the consistent use of names and namespaces, DGIWG has formal relationships with both the OGC and with ISO. As long as having consistent names and namespaces across these organizations does have security implications for certain classes of applications (see below), than shared names and namespaces will be used. Reed Expires Dec 9, 2011 [Page 7] Internet-Draft URN DGIWG Namespace June 2011 6. Security Considerations For many applications that use DGIWG standards and terminology, there are no additional security considerations other than those normally associated with the use and resolution of URNs in general. However, for a certain class of applications related to war fighter and peace keeping operations, there is a high level of importance for having secure methods to access locations once the URN resolution has taken place (i.e. after the name to location resolution). In these cases, agreed to military command and control security (C2), including authentication and authorization shall be considered. However, as the majority of communications in a military environment, just as in any environment, is low level un-secure or minimally secure information. The internet is well used and a URN is necessary for compatible web services. 7. IANA Considerations This document registers with IANA a new formal URN Namespace ID, "dgiwg", following the procedures as defined in RFC 3406 [RFC3406]. The completed registration template is in Section 2 of this document. The affected IANA registry is currently located at: http://www.iana.org/assignments/urn-namespaces. 8. Normative and Informative References 8.1 Normative: [RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997. [RFC3406] Daigle, L., van Gulik, D., Iannella, R., and P. Faltstrom, "Uniform Resource Names (URN) Namespace Definition Mechanisms", BCP 66, RFC 3406, October 2002. [ISO/IEC 646:1991] Information technology - ISO 7-bit coded character set for information interchange 8.2 Informative [DGIWG TCR-07-048] "Concept of Operations for Registration, ConOps for Registers", March 2008. Author's Address Carl Reed, PhD OGC, Inc. 2536 West Prospect Fort Collins, CO US Email: creed@opengeospatial.org Reed Expires Dec 8, 2011 [Page 8]