Related identifier types

Types d'identificateurs liés

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STANDARD 21000-3
First edition
Information technology — Multimedia
framework (MPEG-21) —
Part 3:
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
Reference number
ISO/IEC 21000-3:2003/Amd.1:2007(E)
ISO/IEC 2007
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ISO/IEC 21000-3:2003/Amd.1:2007(E)
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© ISO/IEC 2007

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ii © ISO/IEC 2007 – All rights reserved
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ISO/IEC 21000-3:2003/Amd.1:2007(E)

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

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International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

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 hypermedia


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 granularity

with respect to the identification of Digital Items.

The Amendment also updates information on ISO 15706-2 (ISAN), which has recently been approved as an

International Standard.
© ISO/IEC 2007 – All rights reserved iii
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ISO/IEC 21000-3:2003/Amd.1:2007(E)
Information technology — Multimedia framework (MPEG-21) —
Part 3:
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 terms

and 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 with

Digital 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 can

differ 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.
© ISO/IEC 2007 – All rights reserved 1
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ISO/IEC 21000-3:2003/Amd.1:2007(E)
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 as

defined in ISO/IEC 21000-6.

One example of this is the identification of an abstraction of the work (e.g. composition used when creating a

sound recording).
4.2.1 Syntax

4.2.2 Semantics

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 value

shall 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 Authority

to 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.
4.2.3 Example
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
################################ --!>

2 © ISO/IEC 2007 – All rights reserved
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ISO/IEC 21000-3:2003/Amd.1:2007(E)

The Type element shall only appear as a child element of a Statement that shall appear as a child element

of 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:


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