Internet DRAFT - draft-walsh-urn-web3d

draft-walsh-urn-web3d



Network Working Group                                           A. Walsh
Internet-Draft                                          Web3D Consortium
Expires: September, 25  2002                              March 25, 2002         


               A URN Namespace for the Web3D Consortium (Web3D)
                      draft-walsh-urn-web3d-00.txt

Status of this Memo
               
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Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.
   
Walsh                                                          [Page 1]

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Abstract

   This document describes a Uniform Resource Name (URN) namespace for
   the Web3D Consortium (Web3D) for naming persistent resources
   such as technical documents and specifications, Virtual Reality 
   Modeling Language (VRML) and Extensible 3D (X3D) files and resources,
   Extensible Markup Language (XML) Document Type Definitions (DTDs),
   XML Schemas, namespaces, style sheets, media assets, and 
   other resources produced or managed by Web3D. 

1. Introduction

   Web3D is the only non-profit organization with a mandate to develop
   and promote open standards to enable 3D for the Internet, Web and 
   broadcast applications. Web3D is responsible for developing, 
   advancing, and maintaining the VRML97 ISO/IEC International Standard
   (ISO/IEC 14772-1:1997), X3D (the forthcoming official successor to 
   VRML) and related technologies.
   
   Web3D maintains and extends its standardization activities through
   the coordinated efforts of dedicated Working Groups and Task
   Groups and professional Liaisons to related standards bodies 
   such as ISO, W3C, and MPEG. See http://web3d.org/ for details.

   Web3D would like to assign unique, permanent, location-independent 
   names based on URNs for some resources it produces or manages.

   This namespace specification is for a formal namespace.

2. Specification Template

   Namespace ID:

      "web3d" is requested.


Walsh                                                          [Page 2]

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   Registration Information:

      Registration Version Number: 1
      Registration Date: 2002-MM-DD <date submitted to IANA>

   Declared registrant of the namespace:

      Web3D Consortium, Inc. 
      Email: <contact@web3d.org>
      Web: <http://web3d.org>

    c/o 
      Name       : Aaron E. Walsh
      Affiliation: Web3D Working Group Chair; Web3D Liaison to MPEG, W3C
      Address    : 18 Haviland Street, Boston, MA USA 02115
      Phone      : +1 (617) 536-3279
      Email      : <aaron@mantiscorp.com>
      Web        : <http://mantiscorp.com/people/aew/>

   Declaration of syntactic structure:

      URNs assigned by Web3D will have the following hierarchical 
      structure based on the group's organizational structure:

            urn:web3d:{subgroup}:{subgroup-specific string}

      where "subgroup" corresponds to an official Web3D subgroup or 
      activity such as the VRML standard ('vrml97'), Extensible 3D 
      ('x3d'), Universal Media Working Group ('media'), Geographical 
      VRML Working Group ('geovrml'), Humanoid Animation Working Group
      ('hanim') and so forth, and "subgroup-specific string" is a 
      US-ASCII string that conforms to URN Syntax requirements 
      ([RFC2141]).

      In cases where ownership or management of a resource is shared 
      by multiple Web3D subgroups or activities a general category 
      may be used in place of a specific subgroup.

      Chairs of Web3D subgroups and activities assign all unique 
      identifiers that fall within the scope of the subgroup or
      activity that they chair. Chairs of Web3D subgroups and 
      activities are also responsible for publishing the specific 
      structure of URNs assigned by their group or activity.

   Relevant ancillary documentation:

      None

   Identifier uniqueness considerations:

      Identifier uniqueness will be enforced by the Web3D Board of
      Directors (BoD) in cooperation with Chair(s) of corresponding
      Web3D subgroups.



Walsh                                                          [Page 3]

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   Identifier persistence considerations:

      Web3D is committed to maintaining the accessibility and
      persistence of all resources that are officially assigned URNs
      by the organization.

   Process of identifier assignment:

      Assignment is limited to the owner and those authorities that are
      specifically designated by the owner. Web3D may designate portions
      of its namespace for assignment by other parties 

   Process of identifier resolution:

      The owner will develop and maintain "URN catalogs" that map all
      assigned URNs to Uniform Resource Locators (URLs) specifically to 
      enable Web-based resolution of named resources. In the future an
      interactive online resolution system may be developed to automate
      this process.

      The owner will authorize additional resolution services as
      appropriate.

   Rules for Lexical Equivalence:

      URNs are lexically equivalent if they are lexically identical.

   Conformance with URN Syntax:

      No special considerations.

   Validation mechanism:

      None specified.  The owner will develop and maintain URN catalogs.
      The presence of a URN in a catalog indicates that it is valid.

   Scope:

      Global

3. Examples

      The following examples are not guaranteed to be real.  They are
      presented for pedagogical reasons only.

         urn:web3d:vrml97:node:GeoCoordinate
         urn:web3d:vrml97:node:NurbsCurve
         urn:web3d:x3d:schemas:2002:compact
         urn:web3d:x3d:schemas:2002:compromise
         urn:web3d:media:textures:nature:grass
       


Walsh                                                          [Page 4]

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4. Security Considerations

   There are no additional security considerations other than those
   normally associated with the use and resolution of URNs in general.

5. Namespace Considerations and Community Considerations
   
   The Web3D Consortium (formerly "VRML Consortium") long acknowledged  
   the value and utility of URNs starting with the VRML International  
   Standard issued in 1997 (ISO/IEC 14772-1:1997, commonly known as 
   "VRML97"). Annex F.2, "URNs", of that standard outlines non-normative
   use of URNs as a persistent naming mechanism for referenced resources
   such as files, EXTERNPROTOs, textures, and so forth. 
   
   As such numerous VRML players and authoring tools, as well as
   content authoring communities, have adopted Web3D-oriented URNs for
   this purpose despite the fact that no formal "web3d" URN NID has been
   established by the Web3D Consortium. Consequently, interoperability
   of resources named using these disparate naming conventions is 
   difficult, if not impossible, owing to the lack of a single, well
   defined "web3d" URN namespace that is formally registered and 
   maintained by the Web3D Consortium.
  
   In order to promote complete compatibility and interoperability 
   across past, current and future Web3D standards as well as across
   myriad Web3D-related products, tools, and content, the Web3D 
   Consortium believes formal registration and management of the "web3d" 
   URN namespace is necessary and in the best interest of the larger 
   Internet- and Web-based communities it serves.

   The "web3d" URN namespace will be used to name VRML and X3D files and
   resources, XML DTDs and Schemas, namespaces, style sheets, media 
   assets, and other resources produced or managed by Web3D. As an open 
   standards organization any Web3D Consortium resources that are 
   officially named using the "web3d" namespace will be made freely 
   available to the public. 
   
   Resources will be named and maintained in accordance with the 
   process(es) described in this document. Any organization or 
   individual can utilize the  Web3D Consortium's freely available 
   URN catalogs to resolve a resource named therein. Although the Web3D 
   Consortium will control the naming and allocation of resources in 
   order to maintain compliance with the process(es) described in this
   document, resolution and/or use of these resources is unrestricted 
   and without fee in order to promote widespread adoption of open Web3D 
   technologies. To this end related documentation and open source 
   resolvers will be freely provided through the Web3D Consortium's 
   Web site. 
   
   Additionally, member organizations or individuals that wish to name 
   their own resources using the "web3d" namespace may submit such 
   request(s) directly to the corresponding Web3D Working Group 
   (subgroup) for subsequent review.
   
Walsh                                                          [Page 5]

Internet-Draft      URN Namespace for Web3D Consortium        March 2002

6. IANA Considerations

   This document describes a "web3d" URN NID registration for the
   Web3D Consortium that is to be entered into the IANA registry of 
   URN NIDs.

References

   [RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997


Authors Address

    Aaron E. Walsh
    Mantis Development Corp.
    18 Haviland Street
    Boston, MA USA 02115

    Phone: +1 (617) 536-3279
    Email: <aaron@mantiscorp.com>
    Web  : <http://mantiscorp.com/people/aew/>



   
   



   
   
   


   





Walsh                                                          [Page 6]

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Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.













This Internet-Draft expires on September, 25  2002   




Walsh                                                          [Page 7]

Internet-Draft      URN Namespace for Web3D Consortium        March 2002