CSA Group Information Technology - Open Systems Interconnection - Application Layer Structure (Adopted ISO/IEC 9545:1994, second edition, 1994-08-15)

Scope This Recommendation / International Standard refines the description of the Application Layer contained in the Basic Reference Model for OSI (ITU-T Rec. X.200 / ISO/IEC 7498- (1) It provides a framework for coordinating the development of existing and future Application Layer Recommendations and Standards. It is provided for reference by Application Layer Recommendations and Standards. In particular this Recommendation / International Standard: (a) defines the nature of Recommendations and Standards in the Application Layer and the relationships among them (b) defines the architectural framework in which individual OSI Application Layer protocols are developed (c) defines concepts which provide a flexible approach to structuring in the Application Layer (d) defines the categories of identifiable objects which are necessary for the specification and operation of protocols (e) relates distributed information processing activities to the Recommendations and Standards in the Application Layer (f) structures, and relates, specifications in Application Layer Recommendations and Standards (g) identifies the various kinds of specification necessary in Application Layer Recommendations and Standards. This Recommendation / 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 neither specifies services nor protocols for OSI; nor is it an implementation specification for systems, nor a basis for appraising the conformance of implementations.