ISO 10303-14:2005, Industrial automation systems and integration - Product data representation and exchange - Part 14: Description methods: The EXPRESS-X language reference manual
ISO 10303-14:2005 specifies a language for specifying relationships between data that are governed by EXPRESS schemas, and for specifying alternate views of data that are 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 ISO 10303-14:2005: - mapping of data governed by one EXPRESS schema to data governed by another EXPRESS schema; - 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; - specification of requirements for data translators for data sharing and data exchange applications; - specification of alternate views of data defined by an EXPRESS schema; - an alternate notation for application protocol mapping tables; - bidirectional mappings where mathematically possible; - specification of constraints that may be evaluated against data produced by mapping.