摘要
随着ＳＴＥＰ标准应用的逐步广泛和深入，用ＥＸＰＲＥＳＳ语言描述的数据模式将广泛地应用在计算机集成制造系统（ＣＩＭＳ）中，因此，研究ＥＸＰＲＥＳＳ数据模式开发方法就具有十分重要的意义。本文提出了一种开发ＥＸＰＲＥＳＳ数据模式的具体方法。它综合了多种建立信息模型方法的特点，对ＩＤＥＦ１Ｘ的功能进行了扩充，增加了定义域约束（ＤｏｍａｉｎＣｏｎｓｔｒａｉｎｔ）的概念和实体关系断言的图形表示方法，有力地支持了ＥＸＰＲＥＳＳ数据模式的开发。
While the STEP standard is utilized extensively and deeply, the data schema defined in EXPRESS language will be widely implemented in Computer Integrated Manufacturing System(CIMS), therefore, the research on the methodology for the development of EXPRESS data schema becomes very important. This paper proposes a methodology, which extends IDEF1X diagram method and adds the concepts of entity domain constraint and the assertion graphical mehtod. This methodology powerfully support the development of EXPRESS data schema.
