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RFC 4195 - A Uniform Resource Name (URN) Namespace for the TV-Anytime Forum

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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. Kameyama Informational [Page 1] 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: 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 "". 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. Kameyama Informational [Page 2] 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. Kameyama Informational [Page 3] 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). Kameyama Informational [Page 4] 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: Kameyama Informational [Page 5] RFC 4195 A URN Namespace for the TV-Anytime Forum October 2005 Full Copyright Statement Copyright (C) The Internet Society (2005). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf- Acknowledgement Funding for the RFC Editor function is currently provided by the Internet Society. Kameyama Informational [Page 6]