CAN CSA-ISO IEC 9545-1995 Information Technology - Open Systems Interconnection - Application Layer Structure.pdf

1、I N B E R N AT I 0 N A L S TA N D A R D ISO/IEC 9545 Second edition 1994-08-1 5 ( Reaf f i r med 2004) Information technology - Open Systems Interconnection - Application Layer structure Technologies de Iinformation - Interconnexion de systdrnes ouveris (OS11 - Structure de la couche Application Nat

2、ional Standard of Canada CA N/CSA =ISO/IE C-9545-95 International Standard ISO/IEC 9545 : 1994 has been adopted, without modification, as CAN/CSA-ISO/IEC-9545-95, which has been approved as a National Standard of Canada by the Standards May 1995 Council of Canada. Reference number ISO/I EC 9545: 199

3、4(E) ISOlIEC 9545:1994(E) Contents Page 1 2 6 Scope Normative references . 2.1 Identical Recommendations I International Standards 2.2 Paired Recommendations I International Standards equivalent in technical content Definitions Abbreviations . Application Layer concepts . 5.1 5.2 5.3 5.4 5.5 5.6 5.7

4、 5.8 5.9 5.10 5.11 5.12 Introduction Application-processes . Application-entities Application-service-obj ects Application-service-elements Control functions . ASO-associations . ASO-context . AS0 naming Application-associations Application-context Names and directory functions . Operation of applic

5、ation-entity-invocations 6.1 Use of application-associations . 6.2 Operation of ASO-invocations and ASE-invocations . 6.3 Interaction with the supporting service . 6.4 Interaction with the Presentation Layer 6.5 Error recovery and ASO-association 7 Application Layer specifications 7.1 Categories of

6、specification 7.2 Relationships among specifications . 7.3 Properties of specifications 8 9 Abstract syntax definition Registration requirements Annexes A Some aspects of combining ASEs and ASOs . B C Relationship between application-contexts and application profiles . Relationship of the terms of t

7、his edition and the previous edition of ISOAEC 9545 . 0 ISO/IEC 1994 1 1 1 2 2 4 4 4 5 5 6 7 7 8 9 10 11 11 11 12 12 12 12 13 13 13 13 13 14 16 16 17 19 20 All rights reserved . Unless otherwise specified. no part of this publication may be reproduced or utilized in any form or by any means. electro

8、nic or mechanical. including photocopying and microfilm. without permission in writing from the publisher . ISO/IEC Copyright Office Case postale 56 CH-121 I Genhe 20 Switzerland Printed in Switzerland 11 0 ISOnEC ISO/IEC 9545: 1994(E) Foreword IS0 (the International Organization for Standardization

9、) and IEC (the Inter- national Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IS0 or EC participate in the development of International Standards through technical committees established by the respective organization to de

10、al with particular fields of technical activity. IS0 and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with IS0 and IEC, also take part in the work. In the field of information technology, IS0 and E

11、C have established a joint technical committee, ISOAEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Intern

12、ational Standard ISO/IEC 9545 was prepared by Joint Technical Committee ISO/IEC JTC 1, Informarion rechnology, in collaboration with ITU-T. The identical text is published as ITU-T X.207. This second edition cancels and replaces the first edition (ISO/IEC 9545:1989), which has been technically revis

13、ed. Annexes A, B and C of this International Standard are for information only. . 111 ISO/IEC 9545: 1994(E) 0 ISOrnC Introduction This Recommendation I International Standard is a refinement of the description of the OS1 Application Layer contained in ITU-T Rec. X.200 I ISO/IEC 7498-1. The purpose o

14、f this Recommendation I International Standard is to facilitate a coherent and modular approach to Application Layer standardization. It defines a set of architectural principles and concepts that provide a basis for structuring and relating the specifications contained in AppIication Layer Recommen

15、dations and Standards. It defines the internal structure of the Application Layer, providing a framework for the deveIopment of Application Layer Recommendations and Standards. It also describes the general principles underlying the operation of application-protocols. The following subjects are cove

16、red by this Recommendation I International Standard: a) the relationship between distributed information processing and OS1 communication services; b) the structure of application-entities; c) the OSI-service and protocol structure in the Application Layer; and d) ASO-context and application-context

17、. This Recommendation I International Standard onIy considers those aspects of distributed information processing for an application which are relevant for the derivation of generic requirements for the structuring of Application Layer communications. The architectural framework specified in this Re

18、commendation 1 InternationaI Standard embodies concepts that may not be fully supported by existing Application Layer Recommendations and Standards. However, these concepts have been specified so as to provide a basis for the development of future Application Layer Recommendations and Standards whic

19、h, it is anticipated, will require their use. This Recommendation I International Standard may be subject to future expansion, particularly with regard to multi-peer communication, security, application-context management, recovery, and Open Distributed Processing. A companion Technical Report, whic

20、h is currently under development, will provide guidance on applying this Application Layer Structure during the creation of Application Layer service and protocol Recommendations and Standards. iv ISO/IEC 9545 : 1994(E) INTERNATIONAL STANDARD ITU-T RECOMMENDATION INFORMATION TECHNOLOGY - OPEN SYSTEM

21、S INTERCONNECTION - APPLICATION LAYER STRUCTURE 1 Scope This Recommendation I International Standard refines the description of the Application Layer contained in the Basic Reference Model for OS1 (ITU-T Rec. X.200 I ISODEC 7498-1). It provides a framework for coordinating the development of existin

22、g and future Application Layer Recommendations and Standards. It is provided for reference by Application Layer Recommendations and Standards. In particdar this Recommendation I International Standard: defines the nature of Recommendations and Standards in the Application Layer and the relationships

23、 among them; defines the architectural framework in which individual OS1 Application Layer protocols are developed. defines concepts which provide a flexible approach to structuring in the Application Layer; defines the categories of identifiable objects which are necessary for the specification and

24、 operation of relates distributed information processing activities to the Recommendations and Standards in the Application Layer; structures, and relates, specifications in Application Layer Recommendations and Standards; identifies the various kinds of specification necessary in Application Layer

25、Recommendations and Standards. protocols; This Recommendation I International Standard is provided for reference by Application Layer Recommendations and Standards. Its purpose is to facilitate a coherent and modular approach to the structuring of specifications for Application Layer behaviour. It n

26、either specifies services nor protocols for OSI; nor is it an implementation specification for systems, nor a basis for appraising the conformance of implementations. 2 Normative references The following Recommendations and International Standards contain provisions which, through reference in this

27、text, constitute provisions of this Recommendation I International Standard. At the time of publication, the editions indicated were valid. All Recommendations and Standards are subject to revision, and parties to agreements based on this Recommendation I International Standard are encouraged to inv

28、estigate the possibility of applying the most recent editions of the Recommendations and Standards listed below. Members of IEC and IS0 maintain registers of currently valid International Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently valid ITU-T Rec

29、ommendations. 2.1 Identical Recommendations I International Standards - ITU-T Recommendation X.200 (1994) I ISO/IEC 7498- 1 : 1994, Information technology - Open Systems Interconnection - Basic Reference Model. ITU-T Recommendation X.210 (1 993) I ISO/IEC 1073 1 : 1993, Infomation technology - Open

30、Systems Interconnection - Conventions for the Definition of OSI services. CCITT Recommendation X.660 (1992) I ISO/IEC 9834-1: 1993, Information technology - Open Systems Interconnection - Procedures for the operation of OSI Registration Authorities: General Procedures. - - ) Presently at the stage o

31、f draft. ITU-T Rec. X.207 (1993 E) 1 ISO/IEC 9545 : 1994(E) 2.2 Paired Recommendations I InternationaI Standards equivalent in technical content - CCIIT Recommendation X.217 (1992), Service definition for the Association Control Service Element. IS0 8649: 1989, Information technology - Open Systems

32、Interconnection - Service Definition for the Association Control Service Element. CCITT Recommendation X.2 16 (1 988), Presentation service definition for Open Systems Interconnection for CCiTT applications. IS0 8822: 1988, Information processing systems - Open Systems Interconnection - Connection o

33、riented presentation service definition. CCETT Recommendation X.650 (1992), Open System Interconnection (OS) Reference Model for naming and addressing. IS0 7498-3: 1989, inforination processing systems - Open System Interconnection - Basic Reference Model: Naming and Addressing. - - 3 Definitions 3.

34、1 Rec. X.200 1 ISO/IEC 7498-1 apply: For the purposes of this Recommendation I International Standard, the following terms as defined in ITU-T a) abstract syntax; b) apphcation-entity; c) application-process; d) application-process-invocation; application-process-type; (N)-address ; (N)-association;

35、 (N)-entity ; (N)-en ti ty -invocation; (N)-entity-type; (N)- function ; (N)-layer; (N)-protocol; (N)-protocol-control-information; (N) - pro toc ol -data- u ni t ; (N)-service-access-point; q) presentation context; r) real open system; and s) transfer syntax. 3.2 Rec. X.650 I IS0 7498-3 apply: For

36、the purposes of this Recommendation I International Standard, the following terms as defined in CCITT a) AEI-identifier; b) AE-qualifier; c) AE-title; d) AE-type-title; e) AP-invocation-identifier; f) application-association-identifier; g) AP-titIe; h) (N)-directory-function; and i) (N)-protocol-add

37、ressing-information. 2 ITU-T Rec. X.207 (1993 E) ISO/IEC 9545 : 1994(E) 3.3 Rec. X.210 I ISO/IEC 10731 apply: For the purposes of this Recommendation I International Standard, the following terms as defined in ITU-T a) deliver (primitive); b) OSI-service; c) OSI-service primitive; d) OSI-service-use

38、r; and e) submit (primitive). 3.4 For the purposes of this Recommendation I International Standard, the following definitions apply. NOTE - The word “object” is used here in the general English sense. 3.4.1 AE-invocation: A specific utilization of part or all of the capabilities of a given applicati

39、on-entity in support of the communications requirements of an application-process-invocation. NOTE - This is a specific use of the ASO-invocation concept. 3.4.2 Application Layer. AE-type: A description of a class of application-entities in terms of a set of capabilities defined for the NOTE - This

40、is a specific use of the ASO-type concept. 3.4.3 application-association, association: A cooperative relationship between two ASO-invocations which governs their bilateral use of the Presentation Service for communication of information and coordination of their joint operation. NOTE - This is a spe

41、cific use of the ASO-association concept. 3.4.4 the scope of the participating ASO-invocations. application-association-identifier: A name that unambiguously identifies an application-association within 3.4.5 application-association. application-context: A set of rules shared in common by two ASO-in

42、vocations in order to support an NOTE - This is a specific use of the ASO-context concept. 3.4.6 application-context-definition: A specification of an application-context. 3.4.7 application-context- name: A name that unambiguously identifies an application-context-definition. 3.4.8 application-servi

43、ce-element: A set of application-functions that provides a capability for the interworking of application-entity-invocations for a specific purpose; application-service-elements are a component of application- service-objects. NOTE - This definition refines the original definition of application-ser

44、vice-elements in ITU-T Rec. X.200 I ISOAEC 7498- I. 3.4.9 application-service-object: An active element within (or equivalent to the whole of) the application-entity embodying a set of capabilities defined for the Application Layer that corresponds to a specific ASO-type (without any extra capabilit

45、ies being used). NOTE - This is a specific use of the (N)-entity concept defined in ITU-T Rec. X.200 I ISOAEC 7498-1. 3.4.10 ASE-invocation: A specific utilization of part or all of the capabilities of a given application-service-element. 3.4.11 the Application Layer. ASE-type: A description of a cl

46、ass of application-service-elements in terms of a set of capabilities defined for 3.4.12 ASO-association: A cooperative relationship among two or more ASO-invocations for the purpose of communication of information and the coordination of their joint operation. NOTE - This is a specific use of the (

47、N)-association concept. 3.4.13 the participating ASO-invocations. ASO-association-identifier: A name that unambiguously identifies an ASO-association within the scope of 3.4.14 ASO-context: A set of rules shared in common among ASO-invocations in order to support an ASO-association. 3.4.15 ASO-conte

48、xt-definition: A specification of an ASO-context. ITU-T Rec. X.207 (1993 E) 3 ISO/IEC 9545 : 1994(E) 3.4.16 capabilities being used). ASO-invocation: A specific utilization of part or all of the capabilities of a given AS0 (without extra NOTE - This is a specific use of the (N)-entity-invocation con

49、cept defined in ITU-T Rec. X.200 I ISO/IEC 7498-1. 3.4.17 invocation, ASO). ASOI-identifier: A name that unambiguously identifies an AS01 within the scope of the pair (parent 3.4.18 3.4.19 ASOI-tag: A name that unambiguously identifies an ASOI within the scope of the pair (MI, ASO). ASO-name: A name that unambiguously identifies an AS0 within the scope of an AP. 3.4.20 ASO-qualifier: A name that unambiguously identifies an AS0 within the scope of its parent. NOTE - When the AS0 is the AE, the parent of the AS0 is the AP. In all other cases, the parent is the parent ASO. 3.4.21 ASO-title: