ITU-R BT 1699-2-2013 Harmonization of declarative application formats for interactive TV《交互式电视声明应用格式的统一》.pdf

1、 Recommendation ITU-R BT.1699-2(01/2013)Harmonization of declarative application formats for interactive TVBT SeriesBroadcasting service(television)ii Rec. ITU-R BT.1699-2 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the rad

2、io-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional R

3、adiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission

4、 of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series of ITU-R Recomme

5、ndations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur an

6、d related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite news gatherin

7、g TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2013 ITU 2013 All rights reserved. No part of this publication may be repro

8、duced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BT.1699-2 1 RECOMMENDATION ITU-R BT.1699-2 Harmonization of declarative application*formats for interactive TV (Questions ITU-R 131/6 and ITU-T 4/9) (2005-2009-2013) Scope This Recommendation is intended to harmonize the a

9、pplication environment for declarative applications for interactive TV. It specifies common elements, media types, and APIs at the syntactic level of the declarative application environment. The ITU Radiocommunication Assembly, considering a) that digital broadcasting services (satellite, terrestria

10、l and cable) are becoming widely available and offer multimedia applications; b) that multimedia applications comprising video, audio, still-picture, text, graphics, etc. associated with interactive features have been developed; c) that multimedia applications planned or deployed in some Regions are

11、 using the declarative application environment; d) that common application formats are desirable for production and international exchange of multimedia applications; e) that Recommendation ITU-T J.200 defines, in addition to the definition above, the high-level architecture for a harmonized set of

12、interactive application formats and application programming interfaces (APIs) and identifies the structure of application environment comprising the procedural application environment and the declarative application environment for digital television services; f) that Recommendation ITU-T J.202 spec

13、ifies the common core of procedural application formats in the procedural application environment for interactive TV applications; g) that specification of harmonized declarative content formats in the declarative application environment is also required for interactive TV applications, recommends t

14、hat for interactive TV applications in the declarative application environment, the harmonized declarative application formats specified in Annexes 1-7 should be used. *Recommendation ITU-R BT.1889 provides the definition for “declarative application”: An application which primarily makes use of dec

15、larative information to express its behaviour; an XML document instance is an example of a declarative application. 2 Rec. ITU-R BT.1699-2 Annex 1 Common core of the declarative application formats for interactive TV 1 Introduction This Recommendation identifies functional commonality among the decl

16、arative application environments for interactive TV application specifications ACAP-X, BML and DVB-HTML. Elements which are common to these three standards are identified as a “Common Core”. The value of the Common Core is to assist program authors to exchange declarative applications internationall

17、y using these standards. This Recommendation also notes features outside of the Common Core of the covered standards. The goal of this Recommendation is to note these differences to encourage efforts toward increasing commonality between the standards to further improve functionality and enhance eco

18、nomies of scale. 2 Overview This Recommendation is intended to harmonize the application environment for declarative applications for interactive TV. It specifies common elements, media types and APIs at the syntactic level of the declarative application environment to satisfy regional application r

19、equirements for the three standards ACAP-X, BML and DVB-HTML as specified in the normative references below. This Recommendation is divided into seven annexes. Annex 2 describes the Common Core of the three standards. Annex 3 describes additional functionality outside the Common Core for BML. Annex

20、4 describes additional functionality outside the Common Core for ACAP-X. Annex 5 describes additional functionality outside the Common Core for DVB-HTML. The format described in Annex 6 is an intermediate format for translation between formats including the Common Core and the standards covered in t

21、his Recommendation. The format described in Annex 7 is a framework to bind content authored in multiple formats into single content. It is noted that there are other declarative formats such as ETSIMHEG-5, which are not covered in this Recommendation. However, the migration from environments in use

22、to the harmonized environment is assisted by the identification of a Common Core and the translation using the intermediate format. 3 References 3.1 Normative references 1 BML ARIB STD-B24 V5.3 2 ACAP-X ATSC A/101 3 DVB-HTML ETSI TS 102 812 V1.2.2 4 wTVML ETSI TS 102 322 V1.1.1 5 NCL ABNT NBR 15606-

23、2 V2 Rec. ITU-R BT.1699-2 3 Users of this Recommendation are encouraged to investigate the possibility of applying the most recent editions of the references listed above, whose maintenance is the responsibility of the issuing standard bodies. Content authors should refer to the cited documentation

24、to ensure conformity with the semantics provided by those elements, media types and APIs. NOTE 1 BML, ACAP-X, DVB-HTML, wTVML and NCL standards are available via the links in Appendix 1. NOTE 2 By agreement between ITU-R, ABNT, ATSC, ARIB and ETSI, the versions listed in 3.1 were authorized for use

25、by ABNT, ATSC, ARIB and ETSI, and accepted by ITU-R for inclusion in this Recommendation. Any subsequent versions of these standards which have not been accepted and approved by ITU-R are not part of this Recommendation. 3.2 Informative references 1 ETSI-MHEG ETSI TS 202 184 V1.1.1 2 J.202 ITU-T J.2

26、02 3 J.200 ITU-T J.200 3.3 Terms and definitions See the normative references listed in 3.1. Annex 2 Common Core 1 Overview Methodology for Common Core, Common Core of Media types, XML Markup, Stylesheet Markup, Monomedia and Behavioural APIs, which are based on the commonality between ACAP-X, BML a

27、nd DVB-HTML are described below. Note that BML has four content profiles. Except where otherwise noted, all four profiles of BML are assumed. 1.1 Methodology 1.1.1 Layer model Graphics layer should lie on top of other layers such as video or text plane. 1.1.2 Application life cycle There should be a

28、 mechanism to destroy an application from outside the application itself. 4 Rec. ITU-R BT.1699-2 1.2 Media type Common media types are listed in Table 1. TABLE 1 Common media type Image/jpeg Image/png Text/css Application/xhtml+xml 1.3 Schema Common schema is listed in Table 2. TABLE 2 Common schema

29、 http:/ https:/ 1.4 XML markup Common XML markups are listed in Table 3. TABLE 3 Common XML markup module Structure Text Hypertext List Presentation Bidirectional text Forms Image Client Side Image Map Object Frames Target Meta Information Scripting Stylesheet Style Attribute Link Base Rec. ITU-R BT

30、.1699-2 5 Common XML markups for BML for basic services (fixed terminal profile), ACAP-X and DVB-HTML are listed in Table 4. TABLE 4 Common XML markup for BML for basic services, ACAP-X and DVB-HTML Common attributes Core attributes id class Style attributes styleCore modules Structure module body %

31、Core.attrib; head title Text module br %Core.attrib div(1)%Common.attrib p(1), ( 2)%Common.attrib span %Common.attrib Hypertext module a %Common.attrib accesskey href Forms module input(1)%Common.attrib accesskey disabled readonly maxlength type value Object module object(1)%Common.attrib data type

32、Metainformation module meta name content Scripting module script Stylesheet module style (1) Only these elements can be a child element of . (2) Only these elements and CDATA can be a child element of . 6 Rec. ITU-R BT.1699-2 1.5 Stylesheet 1.5.1 Common stylesheet properties Common stylesheet proper

33、ties are listed in Table 5. TABLE 5 Common stylesheet properties Background Clear Outline-color Background-attachment Clip Outline-style Background-color Color Outline-width Background-image Content Overflow Background-position Counter-increment Padding Background-repeat Counter-reset Padding-bottom

34、 Border Display Padding-left Border-bottom Float Padding-rightBorder-bottom-color Font Padding-top Border-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

35、-left-style Height Text-transform Border-left-width Left Top Border-right Letter-spacing Vertical-align 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-ty

36、pe Z-index Border-top-color Margin Nav-index Border-top-style Margin-bottom Nav-left Border-top-width Margin-left Nav-right Border-width Margin-right Nav-up Bottom Margin-top Nav-down Caption-side Outline Rec. ITU-R BT.1699-2 7 Common stylesheet properties for BML for basic services, ACAP-X and DVB-

37、HTML are listed in Table 6. TABLE 6 Common stylesheet properties for BML for basic services, ACAP-X and DVB-HTML media Margin Padding-top Padding-right Padding-bottom Padding-left Border-width Border-style Position Left(1)Top(1)Width(1)Height(1)Z-index Line-height Display Visibility Overflow Backgro

38、und-image Background-repeat Font-family Font-size Font-weight Text-align Letter-spacing White-space (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 Only block

39、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 . 8 Rec. ITU-R BT.1699-2 1.5.2 Common CSS selectors Common CSS selectors are listed in Table 7. TABLE 7

40、 Common CSS selectors Universal Type Descendant Class Id :first-child pseudo-class :link pseudo-class :hover pseudo-class :active pseudo-class :focus pseudo-class :lang pseudo-class :pseudo-elements (:first-child, :first-letter, :before, :after) Common CSS selectors for BML for basic services, ACAP-

41、X and DVB-HTML are listed in Table 8. TABLE 8 Common CSS selectors for BML for basic services, ACAP-X and DVB-HTML Universal Type Dynamic(:focus and :active) Class Id 1.6 Scripting language Common scripting language is ECMAScript 2ndEdition with the following restriction: Number type supports intege

42、r operation only. Common native objects for BML for basic services, ACAP-X and DVB-HTML are listed in Table 9. Rec. ITU-R BT.1699-2 9 TABLE 9 Common native objects for BML for basic services, ACAP-X and DVB-HTML Object Methods, properties (global) NaN parseInt(string, radix) isNaN(number) Object All

43、 Object.prototype All Function prototype length Function.prototype All Array All Array.prototype All String All String.prototype All Boolean All Boolean.prototype All Number Prototype MAX_VALUE MIN_VALUE NaN Number(value) New number(value) Number.prototype All Date prototype Date(year , month , date

44、 , hours , minutes , seconds , ms ) new Date(year , month , date , hours , minutes , seconds , ms ) Date.prototype toString() getFullYear() getUTCFullYear() getMonth() getUTCMonth() getDate() getUTCDate() getDay() getUTCDay() getHours() getUTCHours() getMinutes() getUTCMinutes() getSeconds() 10 Rec.

45、 ITU-R BT.1699-2 TABLE 9 (end) getUTCSeconds() getMilliseconds() getUTCMilliseconds() getImtezoneOffset() setMilliseconds(ms) setUTCMilliseconds(ms) setSeconds(sec , ms) setUTCSeconds(sec , ms) setMinutes(min, , sec , ms) setUTCMinutes(min, , sec , ms) setHours(hours, ,(min, , sec , ms) setUTCHours(

46、hours, ,(min, , sec , ms) setDate(date) setMonth(mon , date) setUTCMonth(mon , date) setFullYear(year , mon , date) setUTCFullYearyear , mon , date toLocaleString() toUTCString() For BML for basic services, the length to represent signed integer is 32 bits including sign. 1.7 DOM API Common DOM APIs

47、 in DOM level 1 are listed in Table 10. TABLE 10 Common DOM level 1 APIs Core fundamental DOMException DOMImplementation DocumentFragment Document Node NodeList NamedNodeMap CharacterData Attr Element Text Comment Common DOM level 1 APIs for the BML for basic services, ACAP-X and DVB-HTML are listed

48、 in Table 11. Interfaces listed in Table 11 that have no specified attributes or methods cover all attributes and methods of the interfaces. Rec. ITU-R BT.1699-2 11 TABLE 11 Common DOM level 1 APIs for BML for basic services, ACAP-X and DVB-HTML Interface Attributes, Methods Core fundamental DOMImpl

49、ementation Document implementation documentElement Node parentNode firstChild lastChild previousSibling nextSibling CharacterData data length Element tagName Text Annex 3 Additional elements, media types and APIs for BML Elements, media types and APIs for BML in addition to those listed in Annex 2 are described below. Items marked “BD)” are common to BML and DVB-HTML. Items marked “BA)” are common to BML and ACAP-X. 1 Additional BML media types Additional BML media types are listed in Ta