Related identifier types
Types d'identificateurs liés
Standards Content (sample)
Information technology — Multimedia
framework (MPEG-21) —
Digital Item Identification
AMENDMENT 1: Related identifier types
Technologies de l'information — Cadre multimédia (MPEG-21) —
Partie 3: Identification des éléments numériques
AMENDEMENT 1: Types d'identificateurs liés
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Amendment 1 to ISO/IEC 21000-3:2006 was prepared by Technical Committee ISO/IEC/TC JTC 1,
Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermediainformation.
This Amendment provides the ability to express the relationship between different identifiers in the context of
MPEG-21 Digital Items and contains information on how to deal with varying levels of functional granularitywith respect to the identification of Digital Items.
The Amendment also updates information on ISO 15706-2 (ISAN), which has recently been approved as anInternational Standard.
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Information technology — Multimedia framework (MPEG-21) —
Digital Item Identification
AMENDMENT 3: Related identifier types
In Clause 1, insert new bullet between the 2nd and 3rd bullet with the following text:⎯ How to express the relationship between the two above identifiers;
⎯ How to deal with varying levels of functional granularity for Digital Item identifiers;Replace the entire text of subclause 1.1 with the following text:
This specification contains five Clauses and five Annexes:
The remainder of this Clause 1 contains an overview of MPEG-21 Digital Items and the relation between
parts 2 and 3 of ISO/IEC 21000. Clauses 2 and 3 contain normative references and a list of applicable termsand definitions.
Clause 4 specifies how to uniquely identify Digital Items, how to associate related identifiers with Digital Items
and how to identify different types of Digital Items. Clause 5 then specifies how to associate metadata withDigital Items by using description scheme identifiers.
Annex A contains criteria that need to be fulfilled by a Registration Authority that is required for the
identification of Digital Items and their parts as specified in ISO/IEC 21000-3. Annex B contains an example of
how to resolve a unique identifier to appropriate metadata. Annex C contains a list of existing identification
schemes that can be used by this specification. Annex D provides an approach to dealing with varying
functional granularities for identifying Digital Items. Finally, Annex E contains information of patent statements
relating to ISO/IEC 21000-3. While Annex A is normative, Annexes B, C, D and E are informative.In Clause 2, insert the following reference:
ISO/IEC 21000-6, Information technology — Multimedia framework (MPEG-21) — Rights Data Dictionary
In subclause 3.1, insert definition for the term “Functional Granularity” as follows:
The principle of Functional Granularity states that it shall be possible to uniquely identify a Digital Item
whenever it needs to be distinguished from another Digital Item. Functional Granularity of identification candiffer from User to User.
In subclause 3.1, insert definition for the term “Relator” as follows:
A term that describes the relationship between two entities.
NOTE This definition is equivalent to the definition in ISO/IEC 21000-6.
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Replace the entire text of subclause 4.2 with the following text:
4.2 RelatedIdentifier Element
While the Identifier element is intended to enable the unique identification of Digital Items (or parts thereof),
the RelatedIdentifier element conveys identification information that is related to the Digital Item (or parts
thereof) which may be required by certain Users. This relationship is expressed through the use of Relators asdefined in ISO/IEC 21000-6.
One example of this is the identification of an abstraction of the work (e.g. composition used when creating asound recording).
The RelatedIdentifier element allows associating identifiers that are related to the Digital Item, container,
component, and/or fragment thereof but do not directly identify the Digital Item (or part thereof). The valueshall be in the form of a URI.
A Registration Authority is set up for maintaining a list of identification schemes to be used within
ISO/IEC 21000-3. Requirements for the Registration Authority can be found in Annex A of ISO/IEC 21000-3.
Values of the RelatedIdentifier element are not required to be registered with the Registration Authorityto be conformant to Clause 4.2 of ISO/IEC 21000-3.
The RelatedIdentifier element shall not be used for identifying the Digital Item (or part thereof) itself.This shall be done using the Identifier element.
The relationshipType attribute enables expressing the relationship of the Resource identified by a
RelatedIdentifier to the Digital Item (or part thereof) bearing the RelatedIdentifier. The value shall be in the
form of a URI. A Relator shall be identified with a URI of the form urn:mpeg:mpeg21:2002:01-RDD-NS:x,as specified in ISO/IEC 21000-6.
See Figure 7 for a specific example for the RelatedIdentifier element.
Replace the text of subclause 4.3.1 by the following text:
ISO/IEC 21000-3 Type Element
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The Type element shall only appear as a child element of a Statement that shall appear as a child elementof a Descriptor that shall appear as a child element of an Item.
Replace the text of subclause 4.3.2 by the following text:
The Type element will allow identifying special types of Digital Items. Such types can be defined, for example,by different parts of ISO/IEC 21000 or ISO/IEC 23000.
In subclause 4.4, replace schema definition by the following Schema text: