The concept of Profiles for OSI, and the structure of the International Standardized Profiles that document them, are defined in ISO/IEC TR 10000-1. Such Profiles are divided into a number of different classes and sub-classes. Two of these classes contain sub-classes comprising functions of the Virtual Terminal Basic Class Service and Protocol specified in the base standards ISO 9040 and ISO 9041. These are the Application Profiles (A-Profiles) and the Interchange Format and Representation Profiles (F-Profiles).
The relationship between A-Profiles and F-Profiles is described in 7.3.2 of ISO/IEC TR 10000-1 and is as follows. Application Layer base standards require, implicitly or explicitly, the structure of information carried or referenced by them to be specified for each instance of communication. It is the purpose of F-Profiles to specify such information structures. Particular functional requirements may then be met by the combination of an A-Profile with one or more F-Profiles.
Established of a VT-association involves the selection by negotiation of a particular Virtual Terminal Environmental profile (VTE-profile), and of particular values for any arguments of that VTE-Profile. The VTE-profile specification, and possibly also the values of certain VTE-Profiles arguments, may in turn reference the definitions of VT control object types and assignment types. These VTE-Profiles, control object types and assignments types are thus information structures that require explicit reference within the VT protocol. Particular instances of these stuctures are fully defined within the base standards, but the base standards also provide for further instances to be defined by registration. Each registered instance constitutes an F-Profile within the framework of ISO/IEC TR 10000.