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ISO 10303-11:2004 Industrial automation systems and integration - Product data representation and exchange - Part 11: Description methods: The EXPRESS language reference manual
standard by International Organization for Standardization, 11/01/2004
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Full Description
ISO 10303 specifies a language by which aspects of product data can be defined. The language is called EXPRESS. ISO 10303-11:2004 also specifies a graphical representation for a subset of the constructs in the EXPRESS language. This graphical representation is called EXPRESS-G. EXPRESS is a data specification language as defined in ISO 10303-1. It consists of language elements that allow an unambiguous data definition and specification of constraints on the data defined.
The following are within the scope of ISO 10303-11:2004:
data types;constraints on instances of the data types.The following are outside the scope of this part of ISO 10303:
definition of database formats;definition of file formats;definition of transfer formats;process control;information processing;exception handling.EXPRESS is not a programming language.