Network Working Group W. Kameyama
Request for Comments: 4195 GITS, Waseda University
Category: Informational October 2005
A Uniform Resource Name (URN) Namespace for the TV-Anytime Forum
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
This document describes a Uniform Resource Name (URN) namespace that
is engineered by the TV-Anytime Forum for naming persistent resources
published by the TV-Anytime Forum including the TV-Anytime Forum
Standards, XML (Extensible Markup Language) Document Type
Definitions, XML Schemas, Namespaces, and other documents.
1. Introduction
The TV-Anytime Forum produces many kinds of documents (i.e.,
specifications, working documents, and schemas) that are currently
being considered for adoption by many standardization bodies such as
ETSI (European Telecommunication Standardization Institute), DVB
(Digital Video Broadcasting), ARIB (Association of Radio Industries
and Businesses), and ATSC (Advance Television Systems Committee).
The TV-Anytime Forum wishes to provide global, distributed,
persistent, location-independent names for these resources.
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RFC 4195 A URN Namespace for the TV-Anytime Forum October 2005
2. Specification Template
Namespace ID:
"tva"
Registration information:
Registration Version Number: 1
Registration Date: 2005-1-6
Declared registrant of the namespace:
Name: Wataru KAMEYAMA
Title: Vice Chairman and Secretary, The TV-Anytime Forum
Affiliation: Graduate School of Global Information
and Telecommunication Studies, Waseda University
Address: 1011 Okuboyama, Nishi-tomida, Honjo-shi, Saitama
367-0035, JAPAN
Phone: +81 495 24 6052
Email: wataru@waseda.jp
Declaration of structure:
The Namespace Specific String (NSS) of all URNs assigned by the
TV-Anytime Forum will have the following hierarchical structure:
urn:tva:{category}:{string}
where the "category" is a US-ASCII string that conforms to URN
syntax requirements ([RFC2141]), and "{string}" is a string that
confirms to URN syntax requirements ([RFC2141]).
Relevant ancillary documentation:
The TV-Anytime Forum specifications have been publicly available
at all stages during their development from
"ftp://tva:tva@ftp.bbc.co.uk/Specifications/". The final
specifications are also available as formal ETSI (European
Telecommunication Standardization Institute) technical
specification documents, ETSI TS 102 822 series.
Identifier uniqueness considerations:
The TV-Anytime Forum shall establish unique identifiers as
appropriate.
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RFC 4195 A URN Namespace for the TV-Anytime Forum October 2005
Uniqueness is guaranteed as long as the assigned "{category}" is
never reassigned for other categories. The TV-Anytime Forum is
responsible for this.
Identifier persistence considerations:
The TV-Anytime Forum 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 at the level of "category"s, and persistence
of category assignment.
Process of identifier assignment:
All the assignments of identifiers are fully controlled and
managed by the TV-Anytime Forum.
Process of identifier resolution:
The namespace is not listed with an RDS; this is not relevant.
Rules for Lexical Equivalence:
The "{category}" is case-insensitive. Thus, the portion of the
URN:
urn:tva:{category}:
is case-insensitive for matches. The remainder of the identifier
shall be considered case-sensitive; hence, URNs are only lexically
equivalent if they are also lexically identical in the remaining
{string} field.
Conformance with URN Syntax:
No special considerations.
Validation mechanism:
Validation shall be done by a syntax grammar corresponding to each
"{category}".
Scope:
Global.
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RFC 4195 A URN Namespace for the TV-Anytime Forum October 2005
3. Examples
The following examples are not guaranteed to be real. They are
provided for pedagogical reasons only.
urn:tva:metadata:2002
urn:tva:metadata:cs:IntentionCS:2002
urn:tva:metadata:cs:ActionTypeCS:2002
urn:tva:rmp:tvax
4. Community Considerations
The names in this namespace are to be used in any public
implementations of the TV-Anytime Forum specifications so that
anybody can benefit from the officially assigned namespace.
Potential beneficiary communities include:
a) Implementers of the TV-Anytime specifications.
Resources that comply with the TV-Anytime Forum specifications
(including TV-Anytime schemas, instance documents that comply with
TV-Anytime schemas, and TV-Anytime default Classification Schemes)
may, by means of the registered namespace, become exposed to the
general Internet and gain from the interoperability benefits of
the Internet at large.
b) Implementers of other specifications that incorporate components
of the TV-Anytime specifications.
URNs used to identify TV-Anytime components may be used to enable
their inclusion in, and enhancement of, other specifications while
maintaining, to a certain degree, interoperability with the TV-
Anytime community (see a) above).
c) Implementers of other semantically related specifications that do
not directly incorporate components of the TV-Anytime
specifications.
URNs used to identify components of the TV-Anytime specifications,
such as identifiers of terms within default Classification
Schemes, may enable interoperation with other semantically
determined specifications (including present and future
metadata/resource description and ontology specifications) of
relevance to TV-Anytime implementation communities (see a) and b)
above).
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RFC 4195 A URN Namespace for the TV-Anytime Forum October 2005
5. Namespace Considerations
This application requires a unique namespace because the assignment
mechanism requires delegation to the TV-Anytime Forum. As a
namespace used to identify components of the TV-Anytime
specifications, the TV-Anytime Forum will manage the inter-
relationship of the components and the uniqueness of the identifiers.
6. Security Considerations
There are no additional security considerations other than those
normally associated with the use and resolution of URNs in general.
Informative References
[RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997.
Author's Address
Wataru KAMEYAMA
GITS, Waseda University
1011 Okuboyama, Nishi-tomida
Honjo-shi, Saitama, 367-0035
JAPAN
Phone: +81 495 24 6052
EMail: wataru@waseda.jp
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RFC 4195 A URN Namespace for the TV-Anytime Forum October 2005
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Acknowledgement
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Internet Society.
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