1、 Reference numberISO/IEC 21000-2:2005(E)ISO/IEC 2005 INTERNATIONAL STANDARD ISO/IEC21000-2Second edition2005-10-01Information technology Multimedia framework(MPEG-21)Part 2:Digital Item Declaration Technologies de linformation Cadre multimdia(MPEG-21)Partie 2:Dclaration darticle numrique ISO/IEC 210
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5、C 2005 All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either ISO at the address below or ISOs member body in the coun
6、try of the requester.ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel.+41 22 749 01 11 Fax +41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2005 All rights reserved ISO/IEC 21000-2:2005(E)ISO/IEC 2005 All rights reserved iiiContents Page Foreword
7、.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
8、.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 Declara
9、tion 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
10、.13 .27 7.2.14 .31 7.2.15 .34 ISO/IEC 21000-2:2005(E)iv ISO/IEC 2005 All rights reserved 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
11、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.7
12、8 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 edit
13、ion DIDL document.86 Bibliography.88 ISO/IEC 21000-2:2005(E)ISO/IEC 2005 All rights reserved vForeword ISO(the International Organization for Standardization)and IEC(the International Electrotechnical Commission)form the specialized system for worldwide standardization.National bodies that are membe
14、rs 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 organi
15、zations,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 Directi
16、ves,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.
