1、ITU-T RECNN*T*418 93 m 4862571 0570489 705 m INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU TELEMATIC SERVICES TERMINAL EQUIPMENTS AND PROTOCOLS FOR TELEMATIC SERVICES T.418 (03/93) INFORMATION TECHNOLOGY - OPEN DOCUMENT ARCHITECTURE (ODA) AND INTERCHANGE
2、 FORMAT: GEOMETRIC GRAPHICS CONTENT ARCHITECTURE ITU-T Recommendation T.418 ITU-T RECMN*T*4L8 93 m 4862571 0590490 427 m Foreword ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector
3、(ITU-T) is a permanent organ of the ITU. Some 179 member countries, 84 telecom operating entities, 145 scientific and industrial organizations and 38 international organizations participate in ITU-T which is the body which sets world telecommunications standards (Recommendations). The approval of Re
4、commendations by the Members of ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, 1993). In addition, the World Telecommunication Standardization Conference (WTSC), which meets every four years, approves Recommendations submitted to it and establishes the study programm
5、e for the following period. In some areas of information technology, which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. The text of ITU-T Recommendation T.418 was approved by the WTSC (Helsinki, March 1-12, 1993). The identical text is a
6、lso published as ISO/IEC International Standard 8613-8. NOTES 1 As a consequence of a reform process within the International Telecommunication Union (ITU), the CCIT ceased to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was created as of 1 Mar
7、ch 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 Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector.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 has been made in the text to references containing the acronyms “CCITT, CCIR or IFRB” or their associated entitie
8、s such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 telecommunication administration and a recognized operating agency. In this Recommendation, the expression “Administration” is used for concise
9、ness to indicate both a O ITU 1994 All rights reserved. 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 the ITU. . CONTENTS INTRODUCTION . 1 2 3 4 5 6 7 8 9 10 Sc
10、ope Normative references . 2.1 Identical Recommendations I International Standards 2.2 Paired Recommendations I International Standards equivalent in technical content 2.3 Additional references Definitions Abbreviations . Conventions., 5.1 CGM 5.2 Individual CGM elements . 5.3 CGM concepts . 5.4 CGM
11、 defaults . 5.5 Parameter names . 5.6 Width and height . General principles 6.1 Content architecture classes 6.2 Content 6.3 Presentation attributes . 6.4 6.5 6.6 Coding of content information . Colour spaces applicable to geometric graphics content architecture . Layout and imaging of the content .
12、 Positioning 7.1 Introduction . 7.2 Measurement units and directions . 7.3 The relationship between the region of interest and the basic layout object . Definition of geometric graphics presentation attributes . 8.1 Shared presentation attributes . 8.1.1 Attributes specifying CGM defaults . 8.1.2 8.
13、1.3 Picture orientation . 8.2 Logical presentation attributes 8.2.1 Picture dimensions 8.3 Content architecture class attributes 8.3.1 Content architecture class . 8.4 Interaction with document architecture attributes : Geometric graphics content portion attributes . 9.1 Common coding attributes 9.2
14、 Content information 9.3 Other coding attributes Formal definitions of geometric graphics content architecture dependent data types 10.1 Introduction . 10.2 Representation of geometric graphics presentation attributes . 10.4 Representation of non-basic features and non-standard defaults Region of in
15、terest specification . 10.3 Representation of coding attributes ITU-T RW . T.418 (1993 E) - Page 5 1 2 2 2 2 2 2 3 3 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 6 8 8 8 18 18 19 19 20 20 20 20 20 20 20 21 21 21 25 25 i ITU-T RECWN*T.418 93 m 4862593 0590492 2TT 1 1 Content layout process . 11.1 Introduction . 11.
16、1.1 Purpose 1 1.1.2 Available area . i 1.1.3 Presentation attributes . 1 1.1.4 1 1 . 1 . 5 Layout of the content 1 1.2 Content layout process for formatted processable content architecture class . 12.1 Introduction . 12.2 Content imaging process for formatted processable form content architecture cl
17、ass . Initialization of the imaging process . Geometric graphics content architecture classes . 12 Content imaging process 12.2.1 12.2.2 Imaging Definition of geometric graphics content architecture classes . 13 Annex A - Summary of ASN.1 object identifiers Annex B - Basic differences between charac
18、ter primitives in the geometric graphics and the content of a basic component structured according to the character content architectures defined in ITU-T Rec . T.416 I Annex C - SGML representation of geometric graphics content-specific attributes for ODL ISO/IEC 8613-6 . c . 1 c.2 c.3 c.4 c.5 Intr
19、oduction., . Names and public identifiers . Representation of attribute values . C.3.2 String parameters C.3.3 Keyword parameters . C.3.1 Constructed parameters . C.3.4 Integer parameters . C.3.5 Real parameters . C.3.6 C.4.1 C.4.2 Aspect source flags (ASF) parameters Presentation attributes . Share
20、d presentation attributes (format attribute-directives) Logical presentation attributes (format directives) . Coding attributes . Index Page 26 26 26 26 26 26 26 27 32 32 32 32 32 33 34 35 36 36 36 36 36 37 37 37 38 38 38 38 39 39 40 ii ITU-T Rec . T.418 (1993 E) - ITU-T RECMN*T=43B 73 4862593 05904
21、93 136 INTRODUCTION This ITU-T Recommendation I International Standard was prepared as a joint publication by ITU-T Study Group 8 and ISOAEC Joint Technical Committee 1. At present, the ITU-T Recommendation T.410-Series I TSOLIEC 8613 consists of - Introduction and general principles; - Document str
22、uctures; - Document profile; - Open document interchange formats; - Character content architectures; - Raster graphics content architectures; - Geometric graphics content architectures; - Formal Specification of the Open Document Architecture (FODA). (The formal specification is applicable to ISOLIE
23、C 8613 only). Further Recommendations I International Standards may be added to this series of ITU-T Recommendations I International Standards. Development of this series of ITU-T Recommendations I International Standards was originally in parallel with the ECMA-101 standard: Open Document Architect
24、ure. This series of ITU-T Recommendations I International Standards is a new edition of the CCITT T.410-Series of Recommendations (1988) and IS0 8613 (1989). Significant technical changes are the inclusion of the following amendments as agreed by ITU-T and ISOAEC: - Alternative representation; - - C
25、olour; - Conformance Testing Annex; - - Security; - Streams; - Styles; - Tiled raster graphics. Annex on use of MHSMOTIS; Document Application Profile, Proforma and Notation; In addition, a number of technical corrigenda have been applied to this IT-T Recommendation I International Standard. This IT
26、U-T Recommendation I International Standard contains three annexes: - - Annex A summarises the ASN. 1 object identifiers (non-integral); Annex B describes the differences between character primitives in the geometric graphics and the content structured according to the character content architecture
27、s defined in ITU-T Rec. T.416 I ISOAEC 8613-6 (non-integral); Annex C describes the SGML representation of geometric graphics content-specific attributes for ODL (integral). (The use of Annex C is applicable to ISOLIEC 8613 only.) - ITU-T Rec. T.418 (1993 E) iii 1TU-T RECflN*T.418 93 4862591 0590494
28、 072 ISO/IEC 8613-8 : 1994 (E) INTERNATIONAL STANDARD ITU-T RECOMMENDATION INFORMATION TECHNOLOGY - OPEN DOCUMENT ARCHITECTURE (ODA) AND INTERCHANGE FORMAT: GEOMETRIC GRAPHICS CONTENT ARCHITECTURES 1 Scope The purpose of the ITU-T Rec. T.410-Series I ISOIEC 8613 is to facilitate the interchange of d
29、ocuments. In the context of these Recommendations I International Standards, documents are to be items such as memoranda, letters, invoices, forms and reports, which may include pictures and tabular material. The content elements used within the documents may include graphic characters, raster graph
30、ics elements and geometric graphics elements, all potentially within one document. NOTE - These Recommendations I International Standards are designed to allow for extensions, including hypermedia features, spreadsheets and additional types of content such as audio and video. In addition to the cont
31、ent types defined in these Recommendations I International Standards, ODA also provides for arbitrary content types to be included in documents. These Recommendations I International Standards apply to the interchange of documents by means of data communication or the exchange of storage media. Thes
32、e Recommendations I International Standards provide for the interchange of documents for either or both of the following purposes: - - to allow presentation as intended by the originator; to allow processing such as editing and reformatting. The composition of a document in interchange can take seve
33、ral forms: formatted form, allowing presentation of the document; processable form, allowing processing of the document; formatted processable form, allowing both presentation and processing. - - - These Recommendations I International Standards also provide for the interchange of ODA information st
34、ructures used for the processing of interchanged documents. This ITU-T Recommendation I International Standard: - defines a geometric graphics content architecture that can be used in conjunction with the document architecture defined in ITU-T Rec. T.412 I ISO/IEC 8613-2; - defines an interface whic
35、h allows the use of content structured according to ISO/IEC 8632 within documents structured according to ITU-T Rec. T.412 I ISO/IEC 8613-2; defines those aspects of positioning and imaging applicable to the presentation of this geometric graphics content architecture in a basic layout object; defin
36、es the presentation attributes applicable to this geometric graphics content architecture; describes a content layout process, which together with the document layout process described in ITU-T Rec. T.412 I ISO/IEC 8613-2, describes the layout of geometric graphics content in basic layout objects an
37、d determines the dimensions of these basic layout objects. - - - ITU-T Rec. T.418 (1993 E) 1 ISO/EC 8613-8 : 1994 (E) 2 Normative references The following ITU-TKCITT Recommendations and International Standards contain provisions which, through reference in this text, constitute provisions of this Re
38、commendation I International Standard. At the time of publication, the editions indicated were valid. Ail Recommendations I Internationai Standards are subject to revision, and parties to agreements based on this Recommendation I International Standard are encouraged to investigate the possibility o
39、f applying the most recent editions of the Recommendations and International Standards listed below. Members of IEC and IS0 maintain registers of currently valid International Standards. The ITU-T Secretariat maintains a list of currently valid ITU-T/CCIT Recommendations. 2.1 Identical Recommendatio
40、ns I International Standards - ITU-T Recommendation T.411 (1993) I ISOAEC 8613-1:1994, Information technology - Open Document Architecture (ODA) and Interchange Format: Introduction and general principles. ITU-T Recommendation T.412 (1 993) I ISOAEC 86 13-2: 1994, Information technology - Open Docum
41、ent Architecture (ODA) and Interchange Format: Document structures. ITU-T Recommendation T.414 (1993) I ISOAEC 8613-4:1994, Information technology - Open Document Architecture (ODA) and Interchange Format: Document profile. ITU-T Recommendation T.415 (1993) I ISOAEC 8613-5:1994, Information technolo
42、gy - Open Document Architecture (ODA) and Interchange Format: Open Document Interchange Format. ITU-T Recommendation T.416 (1993) I ISOAEC 8613-6:1994, Information technology - Open Document Architecture (ODA) and Interchange Format: Character content architectures. ITU-T Recommendation T.417 (1993)
43、 I ISOAEC 8613-7:1994, Information technology - Open Document Architecture (ODA) and Interchange Format: Raster graphics content architectures. - - - - - 2.2 Paired Recommendations I International Standards equivalent in technical content CCITT Recommendation X.208 (1988), Specijication of Abstract
44、Syntax Notation One (ASN.I). - ISOAEC 8824: 1990, Information technology - Open Systems Interconnection - Specijication of Abstract Syntax Notation One (ASN. 1). 2.3 Additional references - ISOAEC 646: 199 1, Information technology - IS0 7-bit coded character set for information interchange. - ISOAE
45、C 8632-1 : 1992, Information technology - Computer graphics - Metafile for the storage and transfer of picture description information - Part I: Functional specification. - ISO/IEC 8632-3: 1992, Information technology - Computer graphics - Metafile for the storage and transfer of picture description
46、 information - Part 3: Binary encoding. - IS0 8879: 1986, Information processing - Text and ofice systems - Standard Generalized Markup Language (SGML). 3 Definitions For the purposes of this Recommendation I International Standard, the definitions given in ITU-T Rec. T.411 I ISOOEC 8613-1, ISO/IEC
47、8632-1 and IS0 8879 apply. 4 Abbreviations For the purposes of this Recommendation I International Standard the abbreviations given in IT-T Rec. T.411 I ISO/IEC 8613-1 apply. 2 ITU-T Rec. T.418 (1993 E) ISODEC 8613-8 : 1994 (E) For the purposes of this Recommendation I International Standard the fol
48、lowing additional abbreviations apply. ASF Aspect source flag CCA Character content architecture GGCA Geometric graphics content architecture NX NY VDC Virtual Device Coordinate(s) Number of columns in pattern array Number of rows in pattern array 5 Conventions For the purposes of this Recommendatio
49、n I International Standard the conventions given in ITU-T Rec. T.411 I ISOAEC 86 13- 1 apply. The following additional conventions are used within this Recommendation I International Standard. 5.1 CGM The term CGM is used to reference the Computer Graphics Metafile defined in ISOAEC 8632. It is used as a qualifier for terms defined in ISOAEC 8632 (for example, CGM elements). 5.2 Individual CGM elements Throughout this Specification whenever individual CGM elements are referred to they are written in uppercase; for example, SCALING MODE. 5.3 CGM concepts Whenever the concepts defined
