STEP模式映射的一种实用方法在STEP标准的应用中, 常需要通过不同STEP应用协议之间或其中某一应用协议的不同视图之间的映射来实现异构系统间的数据交换。本文提出了一种实现STEP模式映射的实用方法。依靠建立(AP203 + PDMschema) 扩展的内存模式, 通过实例映射器, 实现了AP203到PDMschema模式的数据转换。In the app lications of STEP standards, the data exchange between heterogeneous systems is usually needed for schema mapp ing between different STEP app lication p rotocols or between different views in a special STEP app lication p rotocol. A p ractical mapp ing method was p roposed to perform the mapp ing between STEP schemas. An extended combined schema, AP203 + PDMschema schema, was built. By an instance mapp ing tool, the data exchange between AP203 and PDMschema was realized.