GB/T 16656.14-2023 Industrial automation systems and integration—Product data representation and exchange—Part 14:Description methods:The EXPRESS-X language reference manual

Scope

This document specifies a language for defining the relationships between data described by the EXPRESS mode, as well as for specifying alternative views of data described by the EXPRESS mode. This language is called EXPRESS-X.
EXPRESS-X is a structured data mapping language. It consists of language elements that unambiguously specify the relationships between EXPRESS modes.
The following content is within the scope of this document:
—— Mapping from data described by one EXPRESS mode to data described by another EXPRESS mode;
—— Mapping from data described by one version of an EXPRESS mode to data described by another version of the same EXPRESS mode, where the two modes have different names;
—— Specifications for data converters used in data sharing and data exchange applications;
—— Specifications for alternative views of data defined by EXPRESS modes;
—— Other representations of application protocol mapping tables;
—— Mathematically possible bidirectional mappings;
—— Specifications for evaluating the constraints of the data produced by mappings.
The following content is outside the scope of this document:
—— Data mappings defined using methods other than EXPRESS;
—— Identifying versions of EXPRESS modes;
—— Graphical representations of the structure of the EXPRESS-X language.

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