1、 Reference numberISO/IEC 14496-20:2008/Amd.3:2010(E)ISO/IEC 2010 INTERNATIONAL STANDARD ISO/IEC14496-20Second edition2008-12-01AMENDMENT 32010-05-01Information technology Coding of audio-visual objects Part 20:Lightweight Application Scene Representation(LASeR)and Simple Aggregation Format(SAF)AMEND
2、MENT 3:Presentation and Modification of Structured Information(PMSI)Technologies de linformation Codage des objets audiovisuels Partie 20:Reprsentation de scne dapplication allge(LASeR)et format dagrgation simple(SAF)AMENDEMENT 3:Prsentation et modification de linformation structure(PMSI)ISO/IEC 144
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6、below.COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2010 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 addr
7、ess below or ISOs member body in the country 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 2010 All rights reserved ISO/IEC 14496-20:2008/Amd.3:2010(E)ISO/I
8、EC 2010 All rights reserved iii 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 Internation
9、al 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
10、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 t
11、o 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.Attention is drawn to the possibility
12、that some of the elements of this document may be the subject of patent rights.ISO and IEC shall not be held responsible for identifying any or all such patent rights.Amendment 3 to ISO/IEC 14496-20:2008 was prepared by Joint Technical Committee ISO/IEC JTC 1,Information technology,Subcommittee SC 2
13、9,Coding of audio,picture,multimedia and hypermedia information.ISO/IEC 14496-20:2008/Amd.3:2010(E)ISO/IEC 2010 All rights reserved 1 Information technology Coding of audio-visual objects Part 20:Lightweight Application Scene Representation(LASeR)and Simple Aggregation Format(SAF)AMENDMENT 3:Present
14、ation and Modification of Structured Information(PMSI)In Clause 2,add the following references:W3C XPointer Framework,W3C Recommendation 25 March 2003.http:/www.w3.org/TR/xptr-framework/W3C XML Path Language(Xpath)Version 1.0,W3C Recommendation 16 November 1999.http:/www.w3.org/TR/xpath In 3.2,add t
15、he following abbreviated term:EBNF:Extended Backus-Naur Form In Table 3.List of LASeR events,add the following item:Event name Namespace Description Bubble Canc.“xmlUpdate“urn:mpeg:mpeg4:laser:2005 Informs the update of Structured Information referenced by the presentation engine.No No After 6.5.6.4
16、,add the following:6.5.6.5 ExternalResourceEvent Interface xmlUpdateEvent:LASeR Event readonly attribute DOMString resourceURL;readonly attribute DOMString updatedValue;ISO/IEC 14496-20:2008/Amd.3:2010(E)2 ISO/IEC 2010 All rights reserved No defined constants Attributes resourceURL:This value identifies the updated external resource URL including the mpeg-pmsi()fragment externalResource:This value is a new value pointed by resource URL No defined methods Targets of this event must be elements al
