产品信息建模是产品设计活动的基础。
Product information modeling is the foundation of product design activity.
第二章提出了基于符号的产品信息建模基本原理和方法。
Chapter two presents the basic principle and method of product information modeling based on symbol.
中性数据描述和产品分类结构问题，是面向虚拟企业等分布业务的产品信息建模的关键技术。
The problems of neutral-data description and product classification structure are the key techniques in product information modeling oriented to the distributed business of virtual enterprises.
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