TV-Anytime URN: A Uniform Resource Name (URN) Namespace for the TV-Anytime Forum
A stable naming system for TV specifications and documents.
Kameyama, W., "A Uniform Resource Name (URN) Namespace for the TV-Anytime Forum", RFC 4195, DOI 10.17487/RFC4195, October 2005, <https://www.rfc-editor.org/info/rfc4195>.
@misc{rfc4195,
series = {Request for Comments},
number = 4195,
howpublished = {RFC 4195},
publisher = {RFC Editor},
doi = {10.17487/RFC4195},
url = {https://www.rfc-editor.org/info/rfc4195},
author = {W. Kameyama},
title = {{A Uniform Resource Name (URN) Namespace for the TV-Anytime Forum}},
pagetotal = 6,
year = 2005,
month = oct,
} RFC text
Contents
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.
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.
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.
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).
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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Copyright (C) The Internet Society (2005).
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Acknowledgement
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AI ELI5
On this page
§1Introduction
The TV-Anytime Forum develops specifications, working documents, and XML schemas that major standardization bodies—including the European Telecommunication Standardization Institute (ETSI), Digital Video Broadcasting (DVB), the Association of Radio Industries and Businesses (ARIB), and the Advance Television Systems Committee (ATSC)—consider for adoption.
The forum wanted to provide permanent, globally distributed, location-independent names for these resources so they could be reliably referenced across organizations and remain valid over time.
Different TV groups around the world want to use the same rulebooks. The forum needed a way to give these documents names that work everywhere and never break.
§2The URN Structure
The TV-Anytime Forum URN namespace uses the namespace ID tva, making URNs in the form urn:tva:{category}:{string}. The category is a US-ASCII string following URN syntax requirements, and the string portion identifies the specific resource.
For example, URNs might look like urn:tva:metadata:2002 or urn:tva:metadata:cs:IntentionCS:2002. The category portion is case-insensitive for matching purposes, but the remainder of the identifier is case-sensitive, meaning urn:tva:METADATA:data and urn:tva:metadata:data refer to the same resource but differ only in the case-sensitive portion.
The naming pattern looks like a postal address: urn:tva: is like the country, then a category like the city, then a specific identifier like a street address.
§3Management and Persistence
The TV-Anytime Forum maintains full control and management of all identifier assignments. Uniqueness is guaranteed as long as each category is never reassigned for different purposes, a responsibility the forum accepts.
The forum commits to maintaining the accessibility and persistence of all resources officially assigned URNs. Persistence depends on proper delegation at the category level and the forum's commitment to maintaining those assignments over time.
The TV group promises to keep these names working and never reuse a category for something else. That way, old references always find the right thing.
§4Community Benefits
The registered namespace benefits implementers in three ways. First, implementers of TV-Anytime specifications can use these URNs to gain interoperability benefits across the broader Internet. Second, developers of other specifications that incorporate TV-Anytime components can use these URNs to maintain some compatibility with the TV-Anytime community while extending the work. Third, implementers of semantically related specifications can use TV-Anytime identifiers—such as classification scheme terms—to enable interoperation with the TV-Anytime implementation communities.
Having one standard naming system means that software companies building TV systems can talk to each other easily, and other groups can build on TV-Anytime work without conflicts.
§5Security
RFC 4195 notes that there are no additional security considerations beyond those normally associated with the use and resolution of URNs in general. The namespace itself does not introduce new security risks; it is simply a naming mechanism.
This naming system doesn't create any new security problems. It works the same way any permanent name on the internet would.