ISO/IEC 21000-2:2005

INTERNATIONAL ISO/IEC
STANDARD 21000-2
Second edition
2005-10-01
Information technology — Multimedia
framework (MPEG-21) —
Part 2:
Digital Item Declaration
Technologies de l'information — Cadre multimédia (MPEG-21) —
Partie 2: Déclaration d'article numérique

Reference number
©
ISO/IEC 2005
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©  ISO/IEC 2005
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ii © ISO/IEC 2005 – All rights reserved

Contents Page
Foreword. v
Introduction . vi
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 2
4 Symbols and abbreviated terms . 2
5 Conventions . 3
5.1 Naming convention. 3
5.2 Documentation convention . 3
5.3 Namespace prefix conventions. 5
6 Digital Item Declaration Model . 6
6.1 Purpose and Overview . 6
6.2 Abstract Model. 6
6.2.1 Entity Descriptions . 6
6.2.2 container. 6
6.2.3 item. 6
6.2.4 component. 7
6.2.5 anchor . 7
6.2.6 descriptor . 7
6.2.7 condition. 7
6.2.8 choice. 8
6.2.9 selection . 8
6.2.10 annotation. 8
6.2.11 assertion . 8
6.2.12 resource. 8
6.2.13 fragment. 8
6.2.14 statement . 8
6.2.15 predicate . 8
7 Digital Item Declaration Representation. 10
7.1 Purpose and Overview . 10
7.1.1 Purpose. 10
7.1.2 DIDL Overview. 10
7.2 DIDL Definition . 11
7.2.1 Validation. 11
7.2.2 Canonicalization . 11
7.2.3 Document modularity. 11
7.2.4 Element Descriptions . 12
7.2.5 . 12
7.2.6 . 14
7.2.7 . 15
7.2.8 . 15
7.2.9 . 17
7.2.10 . 20
7.2.11 . 22
7.2.12 . 25
7.2.13 . 27
7.2.14 . 31
7.2.15 . 34
© ISO/IEC 2005 – All rights reserved iii

7.2.16 . 37
7.2.17 . 38
7.2.18 . 41
7.2.19 . 42
7.2.20 . 45
8 The Digital Item Declaration XML Schema Definitions (informative). 46
8.1 Purpose and Overview . 46
8.2 DID Model Abstract Schema . 47
8.3 DIDL Schema. 49
9 Example Digital Items expressed in DIDL . 57
9.1 Example 1: Using MPEG-7 descriptors in conjunction with a Choice. 57
9.2 Example 2: Expressing the same set of metadata in different descriptor formats. 59
9.3 Example 3: A digital music album. 60
9.4 Example 4: Implementing numeric comparisons in Item configuration . 78
Annex A (informative) Patent statements . 81
Annex B (informative) Differences with ISO/IEC 21000-2:2003. 82
B.1 Introduction . 82
B.2 Attribute-based descriptors. 82
B.3 . 82
B.4 . 82
B.5 and . 83
B.6 . 83
B.7 and XInclude. 83
B.8 Schema definitions . 85
B.9 Converting a first edition DIDL document to a second edition DIDL document . 86
Bibliography . 88

iv © ISO/IEC 2005 – All rights reserved

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
ISO/IEC 21000-2 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
This second edition cancels and replaces the first edition (ISO/IEC
...