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从构造集成化的ＣＡＤ／ＣＡＭ零件模型的目的出发，制定了零件特征分类原则。根据这个原则，提出了特征抽象、分类和特征关系分类及特征类的表达方法。为特征类库的建设、基于特征的零件模型的构造提供了信息单元的组织结构和信息范畴。
From the purpose of constructing integrated CAD / CAM part model, the principle of part feature classification was established. According to this principle, the methods of expressing feature abstract, classification and feature relationship classification and feature class are proposed. For the construction of the feature class library, the structure of the information unit and the information category are provided based on the construction of the feature-based part model.