Design Data Model Based on Design Process

The design data model in traditional CAD tools includes only geometry data. In this paper, a Process-based Design Data Model (PDDM), including product data, design process data and process administration data, is presented. The PDDM is organized on the principles of convenient data layout, data sharing, data reuse and knowledge extraction. In the model, the design data presented by XML technology is platform-independent and language-independent. So the design data are adapted to express data, concepts and context, and easy to be used repeatedly by different users. It's also convenient for transmission and sharing on network, and for being reused in the life cycle of product. The PDDM has been implemented in a Process-based CAD software prototype system.