ISO 10303-14:2005规定了一种语言，用于指定由快速模式管理的数据之间的关系，以及指定由快速模式管理的数据的替代视图。这种语言叫做EXPRESS-X。 EXPRESS-X是一种结构化数据映射语言。它由语言元素组成，这些元素允许明确说明EXPRESS模式之间的关系。 以下内容在ISO 10303-14:2005的范围内: -将一个EXPRESS schema管理的数据映射到另一个EXPRESS schema管理的数据； -将一个版本的EXPRESS schema管理的数据映射到另一个版本的EXPRESS schema管理的数据，其中两个模式具有不同的名称； -数据共享和数据交换应用的数据转换器要求规范； -EXPRESS schema定义的数据替代视图的规范； -应用协议映射表的替代符号； -数学上可能的双向映射； -可根据映射产生的数据进行评估的约束规范。

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.