Coding mechanism for topological entities in semantic feature modeling
语义特征造型的拓扑元素编码机制

The naming and coding for topological entities were all for history-based modeling systems, which could not entirely support history-independent semantic feature modeling.This paper proposed a feature-based method for naming topological entities, and proposed a uniform coding method of topological entities. Gave differentiate methods and coding format for the split faces and edges. And proposed virtual topological entity and sub-edge according to topological entities variation after model modifying. Remained relations between topological entities to realize history-independent model modification. The proposed method was realized in HUST-CAID.