1、ITU-T RECMN*T1504 93 4Bb259L 0594065 207 I NTE RN AT ION AL TELECOM M U N CATION U N I ON ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU T.504 (03/93) TELEMATIC SERVICES TERMINAL EQUIPMENTS AND PROTOCOLS FOR TELEMATIC SERVICES DOCUMENT APPLICATION PROFILE FOR VIDEOTEX INTERWORKING ITU-T Recom
2、mendation T.504 (Previously “CCITT Recommendation”) ITU-T RECMN*T.504 93 M 4862573 05740bb 143 U FOREWORD The ITU Telecommunication Standardization Sector (I-T) is a permanent organ of the International Telecom- munication Union. The ITU-T is responsible for studying technical, operating and tariff
3、questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the IT-T Study Groups which, in their turn, produce Rec
4、ommendations on these topics. IT-T Recommendation T.504 was revised by the ITU-T Study Group VI11 (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). NOTES 1 As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exist as o
5、f 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector. In order not to delay publication of this Recommendation, no change
6、 has been made in the text to references containing the acronyms “CCIT, CCIR or IFRB” or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 telecommunication administrati
7、on and a recognized operating agency. In this Recommendation, the expression “Administration” is used for conciseness to indicate both a O ITU 1994 Ali rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocop
8、ying and microfilm, without permission in writing from the ITU. CONTENTS 1 Scope 2 Field of application 3 References 6 4 Definitions 5 Characteristics supported by this document application profile . 5.1 Overview 5.2 Logical characteristics 5.3 Layout characteristics . Definition of the document app
9、lication profile 6.1 Overview 6.2 Document profile level . Annex A - Summary of ASN . 1 object identifiers . 6.3 Specification of attributes . Recommendation T.504 (0-3) Page 1 1 1 2 2 2 2 2 3 3 3 3 7 1 Recommendation T.504 DOCUMENT APPLICATION PROFILE FOR VIDEOTEX INTERWORKING (Melbourne, 1988; Hel
10、sinki, 1993) 1 Scope 1.1 This Recommendation defines a document application profile which conforms to the T.400-Series Recommendations. Its purpose is to specify a document architecture level and a content architecture level, and to select an interchange format class suitable for videotex interworki
11、ng as defined in configuration 1 of Recommendation F.300 and in Recommendation T.564. 2 Field of application This Recommendation defines a document that is in conformance with the T.400-Series Recommendations and that allows interworking between two videotex services using configuration 1 defined in
12、 Recommendation F.300 and Recommendation T.564. The videotex documents are interchanged only in a formatted form, allowing the recipient to reproduce them as intended by the originator. This document application profile defines the features of the document structure that can be interchanged. 3 Refer
13、ences - Rec. F.300 Videotex service. - Rec. X.200 Reference model of open systems interconnection for CCIT applications. Rec. X.213 Network service definition for open systems interconnection for CCIT applications. Rec. X.2 14 Transport service definition for open systems interconnection of CCLT app
14、lications. - - - Rec. X.224 Transport protocol specification for open systems interconnection for CCU applications. Rec. X.2 15 Session service definition for open systems interconnection of CCIT applications. Rec. X.225 Session protocol specification for open systems interconnection for CCIT applic
15、ations. - - - Rec. X.2 16 Presentation service definition for open systems interconnection for CCIT applications. Rec. X.226 Presentation protocol specification for open systems interconnection for CCIT applications. - - Rec. X.217 Association control service definition for open systems interconnect
16、ion for CCLT applications. - Rec. X.227 Association control service specification for open systems interconnection for CCIT applications. Rec. T. 1 O1 International interworking for videotex services. - - Rec. T.400 Introduction to document architecture, transfer and manipulation. Recommendation T.5
17、04 (OY93) 1 ITU-T RECMN*T.504 73 m 4Bb257L 0574067 752 m - Rec. T.411 Open document architecture (ODA) and interchange format - Introduction and general principles. Rec. T.412 Open document architecture (ODA) and interchange format - Document structures. Rec. T.414 Open document architecture (ODA) a
18、nd interchange format - Document profile. Rec. X.415 Open document architecture (ODA) and interchange format - Open document interchange format (ODIF). Rec. T.431 Document transfer and manipulation (DTAM) - Services and protocols - Introduction and general principles. Rec. T.432 Document transfer an
19、d manipulation (DTAM) - Services and protocols - Service definition. Rec.T.433 Document transfer and manipulation (DTAM) - Services and protocols - Protocol specification. Rec. T.441 Document transfer and manipulation (DTAM) - Operational structure. Rec. T.523 Communication application profile DMI f
20、or videotex interworking. Rec. T.541 Operational application profile for videotex interworking. Rec. T.564 Gateway characteristics for videotex interworking. - - - - - - - - - - 4 Definitions The definitions of the TAWSeries Recommendations apply also to this Recommendation. 5 Characteristics suppor
21、ted by this document application profile 5.1 Overview A videotex document is the information that is retrieved by a single user function and presented as a complete entity. Therefore the purpose of this document application profile is to allow the recipient to image the layout of the interchanged do
22、cument as intended by the originator. This subclause specifies the functional description of the features supported by this document application profile. 5.2 Logical characteristics Not used. 5.3 Layout characteristics 5.3.1 Layout document structure At a given time a document contains one single pa
23、ge which contains one or more blocks. The content of the block is: - “Videotex” content. 5.3.2 Document structure elements 5.3.2.1 Page format The page format is expressed in accordance with the definition of the videotex service or videotex terminal, by using scaled measurement units. The relation
24、between BMUs and SMUs is specified in the document profile. 5.3.2.2 Block size The position and the dimension of the blocks are restricted to be equal to those of the page. Block size not equal to page is for further study. 2 Recommendation T.504 (03/93) ITU-T RECMN*T-504 93 4862591 0594070 674 W 6
25、Definition of the document application profile 6.1 Overview 6.1.1 Document architecture level The document application profile makes use of document architecture class FDA as defined in Recommendation T,412. The document architecture level includes the following structure: - a specific layout struct
26、ure. The document architecture level is defined in Tables 1, 2 and 3. 6.1.2 Content architecture level The content architecture levei that may be used in documents conforming to this document application profile is as follows: - “Videotex”. Details are specified in Recommendation T.101. 6.2 Document
27、 profile level The document profile level used in this document application profile is defined in Table 4. Every document interchanged in accordance with this document application profile must include a document profile. 6.2.1 Interchange format class The interchange format class used in this docume
28、nt application profile is “B as defined in Recommendation T.415. 6.2.2 Definition of document structure The document structure contains a specific layout structure. The number of hierarchical levels is 3, namely: - document layout root; - page; - block. Ail these levels are mandatory. At most one co
29、ntent portion can be associated with one block. 6.3 Specification of attributes The attributes applicable to constituents of the layout structure are defined in Tables 1 and 2, using the following notation: - Attribute not applicable M Attribute is mandatory Nm Attribute is non-mandatory D Attribute
30、 is defaultable * Exceptionally not used by this document application profile Recommendation T.504 (OW3) 3 ITU-T RECMN*T-504 93 4862593 0594073 500 Attribute Shared attributes Object type Object identifier Subordinates Content architecture class Default value list Application comments Layout attribu
31、tes Position Dimensions Page position Medium type TABLE 1R.504 Layout root M M * - Nm - - - - - Attributes applicable to layout objects Attribut Content portion Content identifier layout M Coding attributes D Content information D NOTES 1 According to the specifications of Recommendation T.412 this
32、attribute may be omitted if the value can be derived unambiguously from the transmission sequence of the relevant objects and content portions. 2 The use of these attributes applicable to content portions is specified in Recommendation T.lO1. Type of coding D (Note 1) (Note 2) (Note 2) Page M M * D
33、- - - D D D Block M M * D - D D D - - NOTES 1 derived unambiguously from the transmission sequence of the relevant objects. 2 other values is for further study. According to the specifications of Recommendation T.412 this attribute may be omitted if the value can be For the block, the value of the a
34、ttributes position and dimensions is restricted to those of the page. Using TABLE uT.504 Attributes applicable to content portions (Note 1) (Note 2) (Note 2) 4 Recommendation T.504 (03/93) ITU-T RECMN*T.504 93 4862593 0594072 TABLE 3D.504 Attribute values for layout objects Attribute Shared attribut
35、es Object type Object identifier Content architecture class Default value lists Application comments Layout attributes Position Dimensions Page position Medium type Basic value Document layout root Page Block (Rec. T.412) Videotex content architecture (Table 5) (Rec. T.564) (Rec. T.412 and Notes 1 a
36、nd 2) (Rec. T.412 and Notes 1 and 2) (Rec. T.412 and Note 1) (Rec. T.412) Default value None None None (Table 6) (090) (40,241 (0.0) (Unspecified) 24) 447 m Non-basic value None None None None None None None None None None None NOTES 1 Positions and dimensions are specified by using scaled measureme
37、nt units. The unit scaling factor is defined by the attribute “unit scaling” within the document profile. The “nominal page size” within the attribute “medium type” defines the number of rows and columns to be imaged on the screen by the videotex application in terms of SMUs. For the block, the posi
38、tion and dimensions are those of the page. 2 It has to be taken into account that within the national videotex systems the position is usually determined by (1,l). Recommendation T.504 (03/93) ITU-T RECMN*T-504 93 4862591 0594073 383 W Object type Page Block Content portion TABLE 4R.504 Document pro
39、fde descriptor Defaultable attributes Dimensions Page position Application comments Object identifier Presentation attributes Dimensions Position Application comments Type of coding Coding attributes Content information Data element name Document profile descriptor Specific layout structure Document
40、 characteristics Document application profile Document application profile default Document architecture class Content architecture classes Interchange format class ODA version Unit scaling Document management attributes Title Document date and time Owners Document reference Additional information C
41、lasse M M M M M M M M M M Nm Nm Nm Nm Nm Nm Value 1 018160 1 O18163 NB Comments Presence of specific layout structure Object identifier (Note i) FDA Object identifier (Note 2) NOTES 1 Default values differing from those defined in Recommendation T.412 are specified for the attributes (see Table 3):
42、- content architecture class; - dimensions; - page position; - medium type. The relation specified by this attribute is not taken into account within the videotex interworking application. It is used when 2 printing on paper of a videotex page is intended. TABLE 5rn.504 Defaultable attributes that m
43、ay be specified in a default value list 6 Recommendation T.504 (03/93) ITU-T RECMN*T*504 93 W 4862591 0594074 2LT Liste of attributes Default value I Block Display-indication “Mandatory” Annex A Description ASN. object identifier value Summary of ASN.l object identifiers (This annex forms an integral part of this Recommendation) Reference 018160 Object identifier for this document application profile Table 4, Subclause 6.3 Recommendation T.504 (03/93) 7 ITU-T RECMN*T-504 93 W 4862591 0594075 156 Printed in Switzerland Geneva, 1994
