Research on classification model in user-defined feature library
用户自定义特征库分类模型研究*

This paper proposed a classification model of user-defined feature library based on directed acyclic graph in order to solve the problem that classification of user-defined feature library did not support user-defined feature sharing in traditional CAD system. In the model, implemented classification and sharing of feature through a directed acyclic graph formed by attaching feature information as common sub-node into classification tree, and stored the model by neutral XML document in order to improve the portability of model, at last provided the process of establishing the model. Instance shows that the model is simple and flexible, classification and sharing capabilities of user-defined feature library are improved extremely.