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Terminology

The terminology for class definitions can be confusing, because object, connection, and message definitions are class definitions in a generic sense, in that they define classes, but are not the same as CLASS-DEFINITIONs. To prevent ambiguity, the following conventions are used in this document:

The informal term "class definition" refers generically to any kind of class definition.
The formal terms CLASS-DEFINITION, oBJECT-DEFINITION, CONNECTION-DEFINITION, and MESSAGE-DEFINITION refer to specific types of definition.
The term "type class definition" refers to any definition that creates a subclass of type. For example, an "object class definition" creates a subclass of OBJECT, and could be either a CLASS-DEFINITION or an OBJECT-DEFINITION.

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