This paper describes a product data model as a product structural tree that is composed of data objects and relation objects, and expresses the product structural tree as a matrix.
将产品数据模型表示为包含数据对象和关系对象的树状结构，并用矩阵的形式加以描述。
After the extended directed graph with weightings for describing product information is introduced, the changes of product data model during different stages of design and manufacturing are studied.
在介绍描述产品信息的扩展赋权有向图之后，研究了产品数据模型在设计与制造过程不同阶段的变化。
After the extended directed graph with weightings for describing product information is introduced, the changes of product data model during different stages of design and manufacturing are studied.
在介绍描述产品信息的扩展赋权有向图之后，研究了产品数据模型在设计与制造过程不同阶段的变化。
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