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NEK ISO/IEC 10746-4:1998

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Abstract

The rapid growth of distributed processing has lead to a need for a coordinating framework for the standardization ofOpen Distributed Processing (ODP). This Reference Model of ODP provides such a framework. It creates anarchitecture within which support of distribution, interworking, interoperability and portability can be integrated.The Basic Reference Model of Open Distributed Processing (RM-ODP), (see ITU-T Recs. X.901 to X.904 | ISO/IEC10746), is based on precise concepts derived from current distributed processing developments and, as far as possible,on the use of formal description techniques for specification of the architecture.The RM-ODP consists of:? ITU-T Rec. X.901 | ISO/IEC 10746-1: 2YHUYLHZ:_ Contains a motivational overview of ODP givingscooping, justification and explanation of key concepts, and an outline of ODP architecture. This part isnot normative.? ITU-T Rec. X.902 | ISO/IEC 10746-2: )RXQGDWLRQV:_ Contains the definition of the concepts andanalytical framework and notation for normalized description of (arbitrary) distributed processingsystems. This is only to a level of detail sufficient to support ITU-T Rec. X.903 | ISO/IEC 10746-3 and toestablish requirements for new specification techniques. This part is normative.? ITU-T Rec. X.903 | ISO/IEC 10746-3: $UFKLWHFWXUH: Contains_ the specification of the requiredcharacteristics that qualify distributed processing as open. These are the constraints to which ODPstandards must conform. It uses the descriptive techniques from ITU-T Rec. X.902 | ISO/IEC 10746-2.This part is normative.? ITU-T Rec. X.904 | ISO/IEC 10746-4: $UFKLWHFWXUDO_6HPDQWLFV:_Contains a formalisation of the ODPmodeling concepts defined in ITU-T Rec. X.902 | ISO/IEC 10746-2, clauses 8 and 9, and a formalisationof the viewpoint languages of ITU-T Rec. X.903 | ISO/IEC 10746-3. The formalisation is achieved byinterpreting each concept in terms of the constructs of the different standardized formal descriptiontechniques. This part is normative.The purpose of this Recommendation | International Standard is to provide an architectural semantics for ODP. Thisessentially takes the form of an interpretation of the basic modeling and specification concepts of ITU-T Rec. X.902 |ISO/IEC 10746-2 and viewpoint languages of ITU-T Rec. X.903 | ISO/IEC 10746-3, using the various features ofdifferent formal specification languages. An architectural semantics is developed in four different formal specificationlanguages: LOTOS, ESTELLE, SDL and Z. The result is a formalization of ODP's architecture. Through a process ofiterative development and feedback, this has improved the consistency of ITU-T Rec. X.902 | ISO/IEC 10746-2 andITU-T Rec. X.903 | ISO/IEC 10746-3.An architectural semantics provides the additional benefits of:? assisting the sound and uniform development of formal descriptions of ODP systems; and? of permitting uniform and consistent comparison of formal descriptions of the same standard in differentformal specification languages.Rather than provide a mapping from all the concepts of ITU-T Rec. X.902 | ISO/IEC 10746-2, this Recommendation |International Standard focuses on the most basic. A semantics for the higher level architectural concepts is providedindirectly through their definition in terms of the basic ODP concepts.Examples of the use of some of the formal specification languages in this report can be found in TR 10167 (Guidelinesfor the Application of ESTELLE, LOTOS and SDL).In the following clauses, the concepts are numbered in accordance with the scheme used in ITU-T Rec. X.902 |ISO/IEC 10746-2.This Recommendation | International Standard specifies an architectural semantics for ODP. This is required to:? provide formalisation of the ODP modelling concepts;? assist sound and uniform development of formal descriptions of standards for distributed systems;? act as a bridge between the ODP modelling concepts and the semantic models of the specificationlanguages: LOTOS, SDL, ESTELLE and Z;? provide a basis for uniform and consistent comparison between formal descriptions of the same standardin specification languages that are used to develop an architectural semantics.This part is normative.

Document information

  • Standard from NEK
  • Published:
  • Edition: 1.0
  • Version: 1
  • Document type: NAT
  • ICS 35.080
  • National Committee ISO/IEC JTC 1/SC 7

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