scope:

This International Standard defines (in an abstract way) the externally visible service provided by the OSI Presentation Layer in terms of a) the primitive actions and events at the user/service boundary; b) the parameter data associated with each primitive action and event; c) the relationship between, and the valid sequences of, those actions and events. The service defined in this International Standard is that which is provided by an OSI presentation protocol (in conjunction with the OSI session-service) and which may be used by any OSI application protocol. This International Standard does not specify individual implementations or products, nor does it constrain the implementation of entities and interfaces within a computer system. There is, therefore, no conformance to this International Standard.