1、- STDmBSI BS ISO/IEC 13235-1-ENGL 1778 18 Lb24bb 077b887 7b7 m BRITISH STANDARD Information technology - Open Distributed Processing - Wading function: Specification ICs 35.100.30 BS ISOAEC 13235-1: 1998 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS ISO/IEC 13235-k1998 Am
2、d.No. National foreword Date Comments This British Standard reproduces verbatim ISO/IEC 132351: 1998 and implements it as the UK national standard. The UK participation in its preparation was enmsted to Technical Committee IST/15, Software Engineering, which has the responsibility to: - aid enquirer
3、s to understand the text; - present to the responsible intemationaYEuropem committee any enquiries on the interpretation, or proposais for change, and keep the UK interests informed; - monitor related international and European developments and promulgate them in the UK A list of organizations repre
4、sented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index“,
5、or by using the “Find“ facility of the BSI Standards Electsonic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer
6、 immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISOAEC title page, pages ii to v, a blank page, pages 1 to 80, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document w
7、as last issued. This British Standard, having been prepared under the direction of the DISC Board, was published under the authority of the Standards Committee and comes into effect on 15 October 1999 O BSI 10-1999 ISBN O 580 36201 3 INTERNATIONAL STANDARD ISOIIEC 132354 First edition 1998-1 2-1 5 I
8、nformation technology - Open Distributed Processing - Trading function: Specification Technologies de linformation - Traitement distribu ouvert - Fonction commerciale: Spcifications Reference number ISOA EC 1 3235- 1 1998( E) BS ISO/IEC 13235-1:1998 Contents 5 6 7 8 9 Scope and field of application
9、Normative References . Notations . Definitions 4 .I Definitions from ITU-T Rec . X.902 I ISO/IEC 10746-2 . 4.2 Definitions from ITU-T X.903 I ISOIIEC 10746-3 . Overview of the ODP Trading Function . 5.2 Linking traders . 5.3 Policy . Enterprise specification of the Trading Function . 6.1 Communities
10、 6.2 Roles 6.3 Activities . 6.4 Policies 6.5 Structuring rules Information specification of the Trading Function 7.1 Overview . 7.2 Basic concepts . 7.3 Invariant schema 7.4 Static schema . 7.5 Dynamic schemata . Computational specification of the Trading Function 8.1 Viewpoint correspondences . 8.2
11、 Concepts and data types 8.4 Abstract interfaces . 8.5 Functional interfaces 8.6 Dynamic Property Evaluation interface . 8.7 Trader object template . Conformance statements and reference points 9.1 Conformance requirement for trading function interfaces as server 9.2 Conformance requirements for que
12、ry trader conformance class 9.3 Conformance requirements for simple trader conformance class 5.1 Diversity and scalability 8.3 Exceptions . Page 1 1 1 2 2 3 3 4 4 4 5 5 5 6 6 6 7 7 8 12 13 13 21 22 22 35 37 39 55 56 58 59 60 60 11 STD=BSI BS ISO/IEC L3235-1-ENGL 1778 LbZYbb9 077b873 17T BS ISOLIEC 1
13、3235-1:1998 9.4 Conformance requirements for stand-alone trader conformance class 9.5 Conformance requirements for linked trader conformance class 9.6 Conformance requirements for proxy trader conformance class . 9.7 Conformance requirements for full-service trader conformance class 9.8 Conformance
14、tests . Annex A - ODP-IDL based specification of the Trading Function A.1 Introduction . A.2 ODP Trading Function module . A.3 Dynamic Property module Annex B - ODP Trading Function Constraint Language BNF B.l Introduction . B.2 Language basics B.3 The constraint language BNF Annex C - ODP Trading F
15、unction constraint recipe language C.l Introduction . C.2 The recipe syntax C.3 Example Annex D - Service type repository . D.l Introduction . D.2 Service type repository 60 61 61 61 61 62 62 62 69 71 71 71 72 75 75 75 75 76 76 76 . III I STD-BSI BS ISO/IEC 23235-1-ENGL 2998 LbZqbb9 079b894 02b I BS
16、 ISOLEC 13235-1:1998 Foreword IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IS0 or EC participate in the development of International Stan
17、dards through technical committees established by the respective organization to deal with particular fields of technical activity. IS0 and IEC technical commiltees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with IS0 and
18、 IEC, also take part in the work. In the field of information technology, IS0 and IEC 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 Stand
19、ard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISOAEC 13235- 1 was prepared by Joint Technical Committee ISOAEC JTC 1, Information technology, Subcommittee SC 33, Distribured application services, in collaboration with -T. The identical text is p
20、ublished as ITU-T Recommendation X.950. ISOAEC 13235 consists of the following parts, under the general title Information technology - Open Distributed Processing - Trading function: - Part I: Specification - Part2:(TBD) - Part 3: Provision of trading function using OS1 Directory service Annexes . .
21、 o D form an integral part of this part of ISOflEC 13235. iv STDnBSI BS ISO/IEC 13235-1-ENGL 1778 PI 1b24bb7 077b75 T62 I BS ISOAEC 13235-1:1998 Introduction The rapid growth of distributed processing has lead to a need for a coordinating framework for the standardization of Open Distnbuied Processi
22、ng (ODP). The Reference Madel of Open Distributed Processing (RM-ODP) provides such a framework. It defines an architecture within which support of distribution, interoperability and portability can be integrated. One of the components of the architecture (described in RM-ODP Part 3: Architecture) (
23、ITU-T Rec. X.903 I ISO/IEC 10746-3) is the ODP Trading function. The trading function provides the means to offer a service and the means to discover services that have been offered. This Recommendation I International Standard provides an architecture for systems implementing the trading function a
24、nd the specification of interfaces within the architecture. NOTE - The specification of computational interfaces in this Recommendation I Intemational Standard is technically aligned with the OMG Trading Object Service. The goals of this Recommendation I International Standard are: - - - to provide
25、a standard which is independent of any implementation; to ensure implementations are capable of being made to interoperate (.e. can be federated); to provide sufficient detail to aiiow conformance claims to be assessed. Annex A is a nonnative ODP-IDL specification of the trading function interface s
26、ignatures. Annex B is a normative specification of the ODP trading function constraint language. Annex C is a normative specification of the ODP trading function constraint recipe language. Annex D is an infoimative description of a Service Type Repositov. V STDOBSI BS ISO/IEC 13235-1-ENGL 1798 1b24
27、bbY 079b89b 9T9 m BS ISOAEC 13235-1:1998 INFORMATION TECHNOLOGY - OPEN DISTRIBUTED PROCESSING - TRADING FUNCTION: SPECIFICATION 1 Scope and field of application The scope of this Recommendation I International Standard is: - - - - an enterprise specification for the trading function; an information
28、specification for the trading function; a computational specification for traders (.e. objects providing the trading function); conformance requirements in terms of conformance points. It is not a goal of this Recommendation I International Standard to state how the trading function should be realiz
29、ed. Therefore this Recommendation I International Standard does not include an engineering specification. The field of application for this Recommendation I Intenational Standard is any ODP system in which it is required to introduce and discover services incrementally, dynamically and openly. 2 Nor
30、mative References The following Recommendations and International Standards contain provisions which, trough reference in this text, constitute provisions of this Recommendation I International Standard. At the time of publication, the editions indicated were valid. All Recommendations and Standards
31、 are subject to revision, and parties to agreements based on this Recommendation 1 International Standard are encouraged to investigate the possibility of applying the most recent edition of the Recommendations and Standards listed below. Members of IEC and IS0 maintain registers of currently valid
32、International Standards. The Telecommunication Standardization Bureau of the maintains a list of currently valid ITU-T Recommendations. ITU-T Recommendation X.901 (1997) I ISO/IEC 10746-1:1998, Information rechnology - Open disrribured processing - Reference Model: Overview. ITU-T Recommendation X.9
33、02 (1995) I ISO/IEC 10746-2:1996, Information technology - Open Disrributed Processing - Reference Model: Foundations. ITU-T Recommendation X.903 (1995) I ISOIIEC 10746-3: 1996, Information technology - Open Disrribicred Processing - Reference Model: Architecture. ITU-T Recornmendation X.920 (1997)
34、I ISOIIEC 14750:1998, Information technology - Open Disrribirted Processing - Integuce Definition Language. ISOliEC 135681, Information technology - The 2 Specifcarion Language. - - - - - 3 Notations The information specification of the trading function is described using the Z formal description la
35、nguage. The signature of the computational interface for the trading function is described using ODP Interface Definition Language, in clause 8 and in Annex A. ITU-T Rec. X.950 (1997 E) I STD=BSI BS ISO/IEC 13235-1-ENGL B99a 1b24bb9 079b897 835 m BS ISO/IEC 13235-1:1998 4 Definitions 4.1 This Specif
36、ication is based on the framework of abstractions and concepts developed in RM-ODP and makes use of the following definitions from RM-ODP Part 2: Foundations (see ITU-T Rec. X.902 i ISODEC 10746-2). Definitions from ITU-T Rec. X.902 I ISO/IEC 10746-2 a) action; b) activity; c) behaviour; d) behaviou
37、ral compatibility; e) binding; 0 client object; g) conformance point; h) contract; i) domain; j) establishing behaviour; k) failure; I) identifier; m) initiating object; n) instance; o) interaction; p) interface; q) interface signature; r) name; s) object; t) obligation; u) ODP system; v) permission
38、; w) policy; x) prohibition; y) quality of service; z) reference point; aa) responding object; bb) role; cc) server object; dd) subtype; ee) supertype; ff) template; gg) template type; hh) trading; i) transparency; jj) type; kk) viewpoint. 2 ITU-T Rec. X.950 (1997 E) BS ISO/IEC 13235-1:1998 4.2 This
39、 Specification is based on the framework of abstractions and concepts developed in RM-ODP and makes use of the following definitions from RM-ODP Part 3: Architecture (see ITU-T Rec. X.903 I ISO/IEC 10746-3). Definitions from ITU-T X.903 I ISOAEC 10746-3 communi ty ; computational interface template;
40、 computational viewpoint; dynamic schema; engineering viewpoint; enterprise viewpoint; exporter; information viewpoint; invariant schema; schema; service export; service import; service offer; static schema; technology viewpoint; federation. 5 Overview of the ODP Trading Function In the context of t
41、he ODP goal of providing distribution transparent utilization of services over heterogeneous platforms and networks, the role of the Trading Function is to allow users to find potential services. It is a corollary of distribution that the finding of services will occur dynamically. The ODP trading f
42、unction facilitates the offering and the discovery of instances of interfaces which provide services of particular types. A trader is an object that supports the Trading Function in a distributed environment. It can be viewed as an object through which other objects can advertise their capabilities
43、and match their needs against advertised capabilities. Advertising a capability or offering a service is called “export“. Matching against needs or discovering services is called “import“. Export and import facilitate dynamic discovery of and late binding to services. To export, an object gives the
44、trader a description of a service together with the location of an interface at which that service is available. To import, an object asks the trader for 1 service having certain characteristics. The trader checks against the descriptions of services and responds to the importer with the location(s)
45、 of matched service interface(s). The importer is then able to interact with a matched service. These interactions are shown in Figure i. Sequence of interactions: 1. Export 2. Import 3. Service Interaction Figure 1 - Interaction between the trader and its clients ITU-T Rec. X.950 (1997 E) 3 BS ISOA
46、EC 13236-1:1998 The service interaction could be decoupled from the trading interactions (export and import) by modelling a service provider object and a service user object explicitly. This would imply interactions between service provider and exporter and between importer and service user that are
47、 trading actions, as defined in ITU-T Rec. X.902 I ISOAEC 10746-2. However, these implied interactions need not conform to this Specification. Due to the sheer number of service offers that will be offered worldwide, and the differing requirements that users of the trading service will have, it is i
48、nevitable that the trading service will be split up and that the service offers will be partitioned. Each partition will, in the first instance, meet the trading needs of a community of clients (exporters and importers). Where a client needs a scope for its trading activities that is wider than that
49、 provided by one partition, it will access other partitions either directly or indirectly. Directly means that the client interacts with the traders handling those partitions. Indirectly, means that the client interacts with one trader only and this trader interacts with other traders responsible for other partitions. The latter possibility is referred to as federation of traders. In some cases, interceptors may be required between federated traders. A user of a trader that interoperates with other traders, may associate with only one trader, and can
