INTERNET-DRAFT J. Smith
Network Working Group IBM T. J. Watson Research Center
Expires: May 20, 2002 November 20, 2001
A URN Namespace for MPEG
draft-smith-urn-mpeg-00.txt
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
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This Internet-Draft expires on May 20, 2002.
Copyright Notice
Copyright (C) The Internet Society (2001). All Rights Reserved.
Abstract
This document describes a Uniform Resource Name (URN) namespace for
the Motion Picture Experts Group (MPEG) for naming persistent
resources as part of the MPEG standards. Example resources include
technical documents and specifications, eXtensible Markup Language
(XML) Schemas, classification schemes, XML Document Type Definitions
(DTDs), namespaces, style sheets, media assets, and other types of
resources produced or managed by MPEG.
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1. Introduction
MPEG is a working group of the International Organization for
Standardization (ISO) and International Engineering Consortium (IEC)
in charge of the development of standards for coded representation
of digital audio and video. MPEG has produced MPEG-1, the standard
on which such products as Video CD and MP3 are based, MPEG-2, the
standard on which such products as Digital Television set top boxes
and DVD are based, MPEG-4, the standard for multimedia for the fixed
and mobile web, and MPEG-7 "Multimedia Content Description Interface,"
the standard for description and search of audio and visual content.
Work on MPEG-21 "Multimedia Framework" is currently underway.
MPEG 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:
"mpeg" requested.
Registration Information:
Version: 1
Date: 2001-11-20
Declared registrant of the namespace:
Name: John R. Smith
Title: Chair, MPEG MDS Subgroup
Affiliation: IBM T. J. Watson Research Center
Address: 30 Saw Mill River Road
Hawthorne, NY 10532 USA
Phone: +1 (914) 784-7320
Email: jrsmith@watson.ibm.com
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Declaration of structure:
URNs assigned by MPEG will have the following hierarchical
structure based on the organizational structure of the MPEG
standards:
urn:mpeg:{standard name}:{assigned US-ASCII string}
where "{standard name}" is a US-ASCII string that conforms to
URN Syntax requirements ([RFC2141]) and corresponds to the
name of an MPEG standard (such as "mpeg1", "mpeg2", "mpeg4",
"mpeg7", "mpeg21", and
"{assigned US-ASCII string}" is a US-ASCII string that conforms
to URN Syntax requirements ([RFC2141]).
The individual URNs shall be assigned by MPEG through the process
of development of MPEG standards.
Relevant ancillary documentation:
None
Identifier uniqueness considerations:
MPEG shall establish unique identifiers as appropriate.
Uniqueness is guaranteed as long as the assigned string is never
reassigned for a given standard name and that the standard name
is never reassigned.
Identifier persistence considerations:
MPEG is committed to maintaining the accessibility and
persistence of all resources that are officially assigned URNs
by the organization.
Persistence of identifiers is dependent upon suitable delegation
of resolution at the level of "standard name"s, and persistence
of standard name assignment.
Process of identifier assignment:
Assignment is limited to the owner and those authorities that are
specifically designated by the owner. MPEG may designate portions
of its namespace for assignment by other parties.
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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:
The "standard name" is case-insensitive. Thus, the portion of the
URN:
urn:mpeg:{standard name}:
is case-insensitive for matches. The remainder of the identifier
must be considered case-sensitive.
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:mpeg:mpeg7:schema:2001
urn:mpeg:mpeg7:cs:VideoDomainCS:2001
urn:mpeg:mpeg7:cs:GenreCS:2001
urn:mpeg:mpeg7:cs:ContentCS:2001
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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.
References
[RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997
Author Address
John R. Smith
IBM T. J. Watson Research Center
30 Saw Mill River Road
Hawthorne, NY 10532 USA
Phone: 1 (914) 784-7320
EMail: jrsmith@watson.ibm.com
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Full Copyright Statement
Copyright (C) The Internet Society (2001). All Rights Reserved.
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Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
Expiration date: May 20, 2002
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