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The source of this page is the international standard ISO 10303-11 as clearly indicated in the first sentence. Also the first sentence clearly says what this thing is about "EXPRESS is the data modelling language of STEP and standardized as ISO 10303-11". So I have to reject these changes. If you don't agree say in detail what you miss. Lothartklein 20:26, 2 December 2007 (UTC)