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 ISOLEC 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 I International Standard:

a) defines the nature of Recommendations and Standards in the Application Layer and the relationships among them;

b) defines the architecturai framework in which individual OS1 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 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 neither specifies services nor protocols for OSI; nor is it an implementation specification for systems, nor a basis for appraising the conformance of implementations.