1 Scope
This part of ISO 10303 specifies a language for specifying relationships between data that is governed by
EXPRESS schemas, and for specifying alternate views of data that is governed by EXPRESS schemas. The language is called EXPRESS-X.
EXPRESS-X is a structural data mapping language. It consists of language elements
that allow an unambiguous specification of a relationship between EXPRESS schemas.
The following are within the scope of this part of ISO 10303:
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— mapping of data governed by one EXPRESS schema to data governed by another EXPRESS schema;
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— mapping of data governed by one version of an EXPRESS schema to data governed by another version of that EXPRESS schema, where the two schemas have different names;
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— specification of requirements for data translators for data sharing and data exchange applications;
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— specification of alternate views of data defined by an EXPRESS schema;
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— an alternate notation for application protocol mapping tables;
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— bi-directional mappings where mathematically possible;
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— specification of constraints that may be evaluated against data produced by mapping.The following are outside the scope of this part of ISO 10303:
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— mapping of data defined using means other than EXPRESS;
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— identification of the version of an EXPRESS schema;
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— graphical representation of constructs in the EXPRESS-X language.