EXPRESS: Its origin in STEP

STEP needed a modelling language that was:

independent of a storage or programming paradigm,
exchangeable in ASCII between different computers using different operating systems,
sufficiently rigorous to define all the constraints required to model product data, and
compilable into a schema for at least one of the following: 1) an exchange file (Level 1 Implementation form),

2) a shared memory (Level 2 Implementation form),
3) a shared logical database (Level 3 Implementation form),
4) a share knowledge base (Level 4 Implementation form).

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