1、 International Telecommunication Union ITU-T T.172TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1(06/2008) SERIES T: TERMINALS FOR TELEMATIC SERVICES Multimedia and hypermedia framework MHEG-5 Support for base-level interactive applications Corrigendum 1 Recommendation ITU-T T.172 (199
2、8) Corrigendum 1 ITU-T T-SERIES RECOMMENDATIONS TERMINALS FOR TELEMATIC SERVICES Facsimile Framework T.0T.19 Still-image compression Test charts T.20T.29 Facsimile Group 3 protocols T.30T.39 Colour representation T.40T.49 Character coding T.50T.59 Facsimile Group 4 protocols T.60T.69 Telematic servi
3、ces Framework T.70T.79 Still-image compression JPEG-1, Bi-level and JBIG T.80T.89 Telematic services ISDN Terminals and protocols T.90T.99 Videotext Framework T.100T.109 Data protocols for multimedia conferencing T.120T.149 Telewriting T.150T.159 Multimedia and hypermedia framework T.170T.189 Cooper
4、ative document handling T.190T.199 Telematic services Interworking T.300T.399 Open document architecture T.400T.429Document transfer and manipulation T.430T.449 Document application profile T.500T.509 Communication application profile T.510T.559 Telematic services Equipment characteristics T.560T.64
5、9 Still-image compression JPEG 2000 T.800T.849 Still-image compression JPEG-1 extensions T.850T.899 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T T.172 (1998)/Cor.1 (06/2008) i Recommendation ITU-T T.172 MHEG-5 Support for base-level interactive applications Corr
6、igendum 1 Summary Corrigendum 1 to Recommendation ITU-T T.172 | ISO/IEC 13522-5 provides a set of corrections, specifically the corrections of: 1) spelling errors, 2) ambiguous specifications, 3) missing specifications, and 4) erroneous specifications. The original architecture and the design policy
7、 have been maintained as defined in the original specification. Source Corrigendum 1 to Recommendation ITU-T T.172 (1998) was approved on 13 June 2008 by ITU-T Study Group 16 (2005-2008) under Recommendation ITU-T A.8 procedure. ii Rec. ITU-T T.172 (1998)/Cor.1 (06/2008) FOREWORD The International T
8、elecommunication 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 permanent organ of ITU. ITU-T is responsible for studying technical, operating an
9、d 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, establishes the topics for study by the ITU-T study groups which, in turn, produce R
10、ecommendations 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 standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Rec
11、ommendation, 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 Recommendation may contain certain mandatory provisions (to ensure e.g., interope
12、rability 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 equivalents are used to express requirements. The use of such words does not suggest that
13、compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, val
14、idity 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 received notice of intellectual property, protected by patents, which may be req
15、uired 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-T/ipr/. ITU 2009 All rights reserved. No part of this publication may be reprodu
16、ced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T T.172 (1998)/Cor.1 (06/2008) iii CONTENTS Page 1 Notations 1 1.1 Name of the issue 1 2 Root Class. 1 2.1 Misleading note in Activation behaviour 1 2.2 Generation of the ContentAvailable event 1 2.3 Conditions to se
17、t the AvailabilityStatus to False 1 2.4 Introduction of the ContentPreparation behaviour in the ContentAvailable event . 2 2.5 Definition of the ContentPreparation behaviour. 2 2.6 Clarification of the Preparation behaviour 2 3 Group Class. 3 3.1 Ambiguous situations during context changes. 3 4 Appl
18、ication Class . 3 4.1 Clarification of the description of Spawn in case of limited ApplicationStack . 3 4.2 Targeting Launch and Spawn elementary actions to the currently active Application 3 4.3 Ambiguous situations during context changes. 3 4.4 Handling of events during context changes. 4 4.5 Miss
19、ing specification of the behaviour in case of a failed Quit elementary action. 4 4.6 Wrong order of execution of the actions in the OnRestart attribute 4 5 Scene Class . 4 5.1 Clarification for SetTimer with AbsoluteTime 4 5.2 Missing EmulatedEventType. 5 5.3 Clarification on the Provisions of Use o
20、f the SendEvent elementary 5 6 Ingredient Class . 5 6.1 Mandatory Content Hook . 5 6.2 Wrong initial value for the ContentReference field of the Content attribute 5 6.3 SetData elementary action targeted to “InitiallyActive False“ objects 6 6.4 Targeting Preload and Unload elementary actions to obje
21、ct without content data . 6 6.5 Clarification for the presentation status of Presentable objects 6 6.6 Introduction of the ContentPreparation behaviour 7 6.7 Cancellation of outstanding content retrieval requests in the Destruction behaviour 7 6.8 Modification of the SetData elementary action 7 6.9
22、Clarification of the Preload elementary action. 8 7 Program Class 8 7.1 Program calls and return values . 8 7.2 Clarification for passing input parameters to Programs . 8 7.3 Changing Variable objects during the asynchronous execution of a Program. 8 8 RemoteProgram Class . 9 8.1 Double execution of
23、 parts of the RemoteProgram Class Activation behaviour. 9 9 Palette Class 9 9.1 Missing activation behaviour for the Palette class 9 10 Font Class. 9 10.1 Missing activation behaviour for the Font class. 9 11 CursorShape class. 10 11.1 Missing activation behaviour for the CursorShape class 10 12 Pre
24、sentable Class 10 12.1 Removal of the SetData elementary action . 10 12.2 Modification of the introductory text for subclause 27.4 . 10 13 TokenManager Class. 11 13.1 Misleading example for the MovementTable 11 13.2 Missing Note in the description of the TokenManager class. 11 13.3 Misleading expres
25、sion in the description of the MovementTable 11 iv Rec. ITU-T T.172 (1998)/Cor.1 (06/2008) Page 13.4 Clarification for the range of the MovementIdentifier parameter of the Move elementary action 11 14 ListGroup Class . 12 14.1 Clarification in the description of the ListGroup class. 12 14.2 Clarific
26、ation for inherited attributes 12 14.3 Misleading description of the Positions exchanged attribute 13 14.4 Wrong description of the Deselect behaviour 13 14.5 Spelling error in the description of the ItemList internal attribute 13 14.6 Clarification of the FirstItem internal attribute 13 14.7 Clarif
27、ication of the FirstItemPresented event 14 14.8 Clarification of the LastItemPresented event. 14 14.9 Clarification for the HeadItems event 15 14.10 Clarification for the TailItems event 15 14.11 Clarification for the Preparation behaviour. 15 14.12 Clarification for non-available Visibles in the De
28、struction behaviour. 16 14.13 Clarification for the Activation behaviour 16 14.14 Clarification for non-active Visibles in the Deactivation behaviour . 16 14.15 Clarification of the Update behaviour 17 14.16 New internal behaviour for adjusting an index 17 14.17 Change of the AddItem internal behavi
29、our . 17 14.18 Change of the Delitem internal behaviour 18 14.19 Clarification for the ItemIndex parameter of the GetListItem elementary action 18 14.20 Clarification for the ItemIndex parameter of the GetItemStatus elementary action 18 14.21 Clarification for the ItemIndex parameter of the SelectIt
30、em elementary action 19 14.22 Clarification for the ItemIndex parameter of the DeselectItem elementary action . 19 14.23 Clarification for the ItemIndex parameter of the ToggleItem elementary action . 20 14.24 Clarification for the ItemsToScroll parameter of the ScrollItems elementary action 20 14.2
31、5 Clarification for the NewFirstItem parameter of the SetFirstItem elementary action . 20 15 Visible Class . 21 15.1 Ambiguous description of the OriginalBoxSize attribute and the SetBoxSize elementary action 21 15.2 Introduction of the ContentPreparation behaviour 21 15.3 Clarification for the Acti
32、vation behaviour 21 15.4 Wrong definition in the GetBoxSize elementary action. 22 16 Bitmap Class . 22 16.1 Missing definition for the SetData elementary action on scaled Bitmap objects . 22 17 LineArt Class. 22 17.1 Wrong introductory description of the LineArt internal behaviours . 22 17.2 Wrong d
33、escription of the OriginalRefFillColour exchanged and RefFillColour internal attributes . 22 18 DynamicLineArt Class 23 18.1 Unspecified ranges for the EllipseWidth and EllipseHeight parameters of the DrawArc elementary action 23 18.2 Unspecified ranges for the EllipseWidth and EllipseHeight paramet
34、ers of the DrawSector elementary action 23 18.3 Unspecified ranges for the EllipseWidth and EllipseHeight parameters of the DrawOval elementary action 23 18.4 Wrong description in the definition of the DrawArc elementary action 24 18.5 Missing description in the definition of the DrawPolyline elemen
35、tary action. 24 18.6 Missing description in the definition of the DrawRectangle elementary action 24 18.7 Missing description in the definition of the DrawSector elementary action . 24 18.8 Missing description in the definition of the DrawOval elementary action . 25 18.9 Missing description in the d
36、efinition of the DrawPolygon elementary action. 25 18.10 Clarification on the appearance of DynamicLineArt objects 25 Rec. ITU-T T.172 (1998)/Cor.1 (06/2008) v Page 18.11 Unnecessary Restriction on the usage of SetPosition, BringToFront, SendToBack, PutBefore, and PutBehind elementary actions 26 19
37、Text Class. 26 19.1 Rendering of Text content. 26 Page 19.2 Introduction of the ContentPreparation behaviour 26 19.3 Removal of the SetData elementary action . 27 19.4 Modification of the introduction text for subclause 36.4 27 20 Stream Class 27 20.1 Spelling error in the description of the Multipl
38、ex attribute. 27 20.2 Clarification for the Multiplex exchanged attribute 28 20.3 Spelling error in the formal syntax description for the SetCounterEndPosition elementary action 28 20.4 Remove unnecessary restriction from the SetCounterEndPosition elementary action 28 20.5 Ambiguity between the SetC
39、ounterEndPosition elementary action and the Looping exchanged attribute 28 20.6 Introduction of the ContentPreparation behaviour 29 20.7 Missing definition for SetData on scaled Video objects 29 20.8 Clarification of the StreamPlaying and StreamStopped events 29 20.9 Clarification. 30 21 Audio Class
40、. 30 21.1 Missing activation and deactivation behaviours for the Audio class. 30 22 Interactible Class 31 22.1 Setting the InteractionStatus attribute to False before deactivating an Interactible object . 31 23 Slider Class . 31 23.1 Missing initialization of the SliderValue internal attribute . 31
41、23.2 Missing initialization of the Portion internal attribute . 32 23.3 Forbid targeting the SetData elementary action to Slider objects. 32 23.4 Clarification of the Deactivation behaviour 32 23.5 Wrong description of the Step elementary action. 32 24 EntryField Class. 33 24.1 Clarification of the
42、Deactivation behaviour 33 25 HyperText Class. 33 25.1 Spelling error in the Provisions of Use of the GetLastAnchorFired elementary action. 33 25.2 Clarification of the Deactivation behaviour 33 26 Button Class 34 26.1 Missing exclusion of the SetData elementary action for Button class objects. 34 27
43、 Hotspot Class. 34 27.1 Missing table for the list of changed inherited attributes 34 28 PushButton Class 35 28.1 Missing table for the list of changed inherited attributes 35 28.2 Clarification for the SetLabel elementary action 35 29 SwitchButton Class. 35 29.1 Missing Provisions of Use and Syntax
44、 Description of the Select elementary action 35 29.2 Missing table for the list of changed inherited attributes 36 29.3 Superfluous SetLabel elementary action in SwitchButton class 36 30 Appendix I 36 30.1 Contradiction to the clarification about the use of the TransitionTo elementary action 36 31 A
45、ppendix II. 36 31.1 Missing definition of the default background colour of the screen. 36 31.2 Definition on how to use the ObjectInformation attribute 37 32 Appendix III 37 vi Rec. ITU-T T.172 (1998)/Cor.1 (06/2008) Page 33 Other parts 42 33.1 Clarification for the use of “null“ and “none“ in claus
46、e 3. 42 33.2 Wrong description of the OnStartUp attribute subclause 5.3 42 33.3 Misleading description of Link event data in subclause 5.6 42 33.4 Wrong OMT diagram of the Presentable class in subclause 5.11. 42 33.5 Definition of Context Change 43 33.6 Definition of Presented. 43 33.7 Clarification
47、 for contradictions in the formal syntax description for actions and objects in the text and the Annex 43 33.8 Missing definition of the Null ObjectReference. 44 33.9 Missing definition of the Null ContentReference . 44 33.10 Clarification of the values of ObjectRefVariable objects . 44 33.11 Clarif
48、ication for the event source when the event origin is not available. 44 33.12 Deactivation of Link objects during the execution of their LinkEffect 45 33.13 Change of Variable objects during the asynchronous execution of a Program 45 33.14 Removing of asynchronous events from the event queue during
49、context change 45 33.15 Mapping of ComponentTags to sub-streams . 46 33.16 Encoding error in the Textual Notation for the LineArt class . 46 Rec. ITU-T T.172 (1998)/Cor.1 (06/2008) vii Introduction This corrigendum is a response to public comments to ISO/IEC JTC 1/SC 29/WG 12 from ongoing implementation work with the MHEG-5 standard. The comments contribute to identify several issues of MHEG-5 usage: 1) Spelling errors 2) Ambiguous specification 3) Missing specification 4) Erroneous specification These issues have been collected by JTC 1/
