ITU-T J 201-2014 Harmonization of declarative content format for interactive television applications (Study Group 9)《交互式电视应用中声明性内容格式的统一》.pdf

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1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T J.201 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2014) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Application for Interactive Digital Television Part 1 Har

2、monization of declarative content format for interactive television applications Recommendation ITU-T J.201 Rec. ITU-T J.201 (10/2014) i Recommendation ITU-T J.201 Harmonization of declarative content format for interactive television applications Summary Recommendation ITU-T J.201 is intended to ha

3、rmonize the application environment for declarative content for interactive television. It specifies common elements, media types and APIs at the syntactic level of the declarative application environment. This edition includes enhancements of broadcast markup language (BML) to provide functionaliti

4、es for some scenarios of integrated broadcast-broadband (IBB) digital television (DTV) services. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T J.201 2004-07-14 9 11.1002/1000/1375 1.1 ITU-T J.201 (2004) Amd. 1 2005-03-01 9 11.1002/1000/7821 2.0 ITU-T J.201 2008-10-29 9 11.

5、1002/1000/9583 3.0 ITU-T J.201 2009-12-14 9 11.1002/1000/10547 4.0 ITU-T J.201 2014-10-29 9 11.1002/1000/12313 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/1

6、1.1002/1000/11830-en. ii Rec. ITU-T J.201 (10/2014) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a p

7、ermanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, esta

8、blishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary st

9、andards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the R

10、ecommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalen

11、ts are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed

12、 Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not

13、received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-

14、T/ipr/. ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T J.201 (10/2014) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms define

15、d in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 2 6 Recommendation 2 Annex A Common core 3 A.1 Methodology . 3 A.2 Media type 3 A.3 XML markup 3 A.4 Stylesheet 5 A.5 Scripting language 7 A.6 DOM API . 8 Annex B Additional elements, media types and APIs for BML . 10 B.1 Addi

16、tional BML media types . 10 B.2 Additional BML XML markup 11 B.3 Additional BML CSS properties 12 B.4 Additional BML DOM APIs 13 B.5 Additional functions for integrated broadcast-broadband services 16 Annex C Additional elements, media types and APIs for ACAP-X 19 C.1 Additional ACAP-X media types .

17、 19 C.2 Additional ACAP-X XML markup 19 C.3 Additional ACAP-X CSS properties 20 C.4 Additional ACAP-X stylesheet attributes 20 C.5 Additional ACAP-X DOM APIs 20 Annex D Additional elements, media types and APIs for DVB-HTML 23 D.1 Additional DVB-HTML media types . 23 D.2 Additional DVB-HTML XML mark

18、ups 23 D.3 Additional DVB-HTML CSS properties 24 D.4 Additional DVB-HTML DOM APIs 24 Annex E Presentation interoperability through translation . 26 Annex F Presentation integration of multiple formats for declarative applications . 27 Bibliography. 31 Rec. ITU-T J.201 (10/2014) 1 Recommendation ITU-

19、T J.201 Harmonization of declarative content format for interactive television applications 1 Scope This Recommendation is intended to harmonize the application environment for declarative content for interactive TV. It specifies common elements, media types and APIs at the syntactic level of the de

20、clarative application environment to satisfy regional application requirements for the four standards: ACAP-X ATSC A/101, BML ARIB STD-B24, Ginga-NCL ABNT 15606-2 ABNT 15606-5 and DVB-HTMLETSI TS 102 322 ETSI TS 102 812. This Recommendation is divided into six annexes. Annex A describes the common c

21、ore for XHTML-related technologies of the four standards. Annex B describes additional functionality outside the common core for BML. Annex C describes additional functionality outside the common core for ACAP-X. Annex D describes additional functionality outside the common core for DVB-HTML. The fo

22、rmat described in Annex E is intended as the intermediate format for translation between formats including the common core and the standards covered in this Recommendation. The format described in Annex F is a framework to bind content authored in multiple formats into single content. It is noted th

23、at there are other formats such as ETSI MHEG-5 b-ETSI ES 202 184, which contain declarative functions that are not covered in this Recommendation. However, the migration from environments in current use to the harmonized environment is assisted by the identification of a common core and translation

24、using the intermediate format. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other re

25、ferences are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The referen

26、ce to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T J.200 Recommendation ITU-T J.200 (2010), Worldwide common core Application environment for digital interactive television services. ETSI TS 102 322 ETSI TS 102 322 V1.1.1 (2

27、004), Specification for a Lightweight Microbrowser for interactive TV applications, based on and compatible with WML. ETSI TS 102 812 ETSI TS 102 812 V1.2.1 (2003), Digital Video Broadcasting (DVB); Multimedia Home Platform (MHP) Specification 1.1.1. ABNT 15606-2 ABNT NBR 15606-2 V2 (2007), Digital

28、terrestrial television Data coding and transmission specification Part 2: Ginga-NCL for fixed and mobile receivers: XML application language for application coding. ABNT 15606-5 ABNT NBR 15606-5 V2 (2008), Digital terrestrial television Data coding and transmission specification Part 5: Ginga-NCL fo

29、r portable receivers: XML application language for application coding. ARIB STD-B24 ARIB STD-B24 Ver.5.3 (2013), Data Coding and Transmission Specification for Digital Broadcasting. ATSC A/101 ATSC A/101 (2005), Advanced Common Application Platform (ACAP). 2 Rec. ITU-T J.201 (10/2014) 3 Definitions

30、3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 application programming interface ITU-T J.200 3.1.2 casading style sheet ITU-T J.200 3.1.3 document object model ITU-T J.200 3.1.4 integrated broadcast and broadband (IBB) DTV service b-ITU-T J.205 3.1.

31、5 nested context language ITU-T J.200 3.2 Terms defined in this Recommendation None. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: ACAP-X ACAP declarative (XHTML) API Application Programming Interface BML Broadcast Markup Language CSS Cascading Style

32、 Sheet DOM Document Object Model DTV Digital Television HTML Hyper Text Markup Language IBB Integrated Broadcast-Broadband MHEG Multimedia Hypermedia Experts Group NCL Nested Context Language VOD Video On Demand wTVML worldwide Television Markup Language XHTML extensible Hyper Text Markup Language X

33、ML extensible Markup Language 5 Conventions None. 6 Recommendation The harmonized declarative content formats specified in Annexes A-F should be used for interactive TV applications in the declarative application environment. When additional interoperability to the core functionality of the declarat

34、ive content formats defined in this Recommendation is required, the approach described in Annexes E and F is recommended. Rec. ITU-T J.201 (10/2014) 3 Annex A Common core (This annex forms an integral part of this Recommendation.) Methodology for common core, common core of media types, extensible m

35、arkup language (XML) markup, stylesheet markup, monomedia and behavioural application programming interfaces (APIs), which are based on the commonality between ACAP declarative (XHTML) (ACAP-X), broadcast markup language (BML), Ginga-nested context language (NCL) and DVB-HTML, are described below. N

36、ote that BML has four content profiles. Except where otherwise noted, all four profiles of BML are assumed. Note also that NCL embeds HTML objects requiring the common core conformance. A.1 Methodology A.1.1 Layer model The graphics layer should lie on top of other layers such as video or text plane

37、. A.1.2 Application lifecycle There should be a mechanism to destroy an application from outside the application itself. A.2 Media type Common media types are listed in Table A.1. Table A.1 Common media types Image/jpeg Image/png Text/cascading style sheet (css) Application/xhtml+xml A.3 XML markup

38、Common XML markups are listed in Table A.2. Table A.2 Common XML markup modules Structure Text Hypertext List Presentation Bidirectional text Forms Image Client-side image map Object Frames 4 Rec. ITU-T J.201 (10/2014) Table A.2 Common XML markup modules Target Meta information Scripting Stylesheet

39、Style attribute Link Base Common XML markups for the BML for basic services (“fixed terminal profile“), Ginga-NCL XHTML objects, ACAP-X and DVB-HTML are listed in Table A.3. Table A.3 Common XML markup for BML for basic services, Ginga-NCL XHTML objects, ACAP-X and DVB-HTML Common attributes Core at

40、tributes id class Style attributes style Core modules Structure module body %Core.attrib head title Text module br %Core.attrib div1) %Common.attrib p1), 2) %Common.attrib span %Common.attrib Hypertext module a %Common.attrib accesskey href Forms modules Forms module input1) %Common.attrib accesskey

41、 disabled readonly maxlength type value Rec. ITU-T J.201 (10/2014) 5 Table A.3 Common XML markup for BML for basic services, Ginga-NCL XHTML objects, ACAP-X and DVB-HTML Object module object1) %Common.attrib data type Metainformation module meta name content Scripting module script Stylesheet module

42、 style 1) Only these elements can be a child element of . 2) Only these elements and CDATA can be a child element of . A.4 Stylesheet A.4.1 Common stylesheet properties Common stylesheet properties are listed in Table A.4. Table A.4 Common stylesheet properties Background Clear Outline-color Backgro

43、und-attachment Clip Outline-style Background-color Color Outline-width Background-image Content Overflow Background-position Counter-increment Padding Background-repeat Counter-reset Padding-bottom Border Cisplay Padding-left Border-bottom Float Padding-right Border-bottom-color Font Padding-top Bor

44、der-bottom-style Font-family Position Border-bottom-width Font-size Right Border-color Font-style Text-align Border-left Font-variant Text-decoration Border-left-color Font-weight Text-indent Border-left-style Height Text-transform Border-left-width Left Top Border-right Letter-spacing Vertical-alig

45、n Border-right-color Line-height Visibility Border-right-style List-style White-space Border-right-width List-style-image Width Border-style List-style-position Word-spacing Border-top List-style-type Z-index Border-top-color Margin Nav-index Border-top-style Margin-bottom Nav-left 6 Rec. ITU-T J.20

46、1 (10/2014) Table A.4 Common stylesheet properties Border-top-width Margin-left Nav-right Border-width Margin-right Nav-up Bottom Margin-top Nav-down Caption-side Outline Common stylesheet properties for BML for basic services, Ginga-NCL XHTML objects, ACAP-X and DVB-HTML are listed in Table A.5. Ta

47、ble A.5 Common stylesheet properties for BML for basic services, Ginga-NCL XHTML objects, ACAP-X and DVB-HTML media Left1) Background-image Margin Top1) Background-repeat Padding-top Width1) Font-family Padding-right Height1) Font-size Padding-bottom Z-index Font-weight Padding-left Line-height Text

48、-align Border-width Display Letter-spacing Border-style Visibility White-space Position Overflow Background-image 1) The elements , , and must have these property values. The elements , , must not have these property values. Furthermore, the following restrictions should be applied: Display property

49、: Only block element can be applied for , , , and . Only inline values can be applied for , and . Position property: Only absolute values can be applied for , , and . Only static values can be applied for , and . A.4.2 Common CSS selectors Common CSS selectors are listed in Table A.6. Table A.6 Common CSS selectors Universal Type Descendant Class Id :first-child pseudo-class :link pseudo-class :hover pseudo-class :active pseudo-class :focus pseudo-class :la