【摘要】 产品数据管理系统的可扩展性和开放性是系统设计要考虑和解决的重要问题之一．在分析产品数据管理的需求基础上，参考ＳＴＥＰ标准中对产品数据模型的描述和面向对象的建模方法，定义对象并建立基于对象的数据组织和管理机制，从而使系统具有一定的通用性、可扩展性和开放性．更多还原

【Abstract】 A PDM framework with an open structure and strong scalability for data organization is presented. The data expression paradigm with a distributed, multi tier C/S system configuration and an object oriented STEP based data model together with extended ER schema are explored. Moreover, the paper gives the definition of abstract objects and their different types. A prototype PDM system named CASS PDM is under development and is expected to offer a better scalability and adaptability.更多还原