This is a response to the UML 2.0 Request for Proposals on Infrastructure (ad/00-09-01). We propose an architecture
for the definition of UML 2.0 which supports the layered and extensible definition of UML as a family of languages, and depends on the use of package extension (composition) and package template mechanisms in the metamodelling language. This submission defines that architecture and populates it with the definition of a core foundation for the definition of structural and behavioural modelling constructs for UML. Chapter 3 (“Language Architecture”) identifies all those parts of the architecture defined in any given version of this document
