文中从产品知识表达存在的问题出发，提出了基于本体的产品知识表达四层模型，即结构层—行为层—基本功能层—元功能层，给出了各层本体的表示模式。
Because some problems are in the product knowledge representation, so gives the four layers to solve it, which contains the structure layer, behavior layer, basic-function layer and meta-function lay.
基于本体的知识表达是当前知识表示方向的一个研究热点。
Knowledge representation based on ontology is an active research in the study of knowledge representation.
在分析机械产品知识表示形式的基础上，提出基于语义对象的产品知识表达模型方法，阐述了机械产品知识表达模型的信息构成。
According to analyzing methods of knowledge representations for mechanical products design, a new knowledge representation model based on semantic object is described.
此外还提出了与数据无关的多叉树层次结构模型的知识表示方法，它具有很强的表达能力并易于扩展。
The data-independent multi-branch tree hierarchical structure is proposed for the knowledge representation, because it has strong expressing ability and can be easily expanded.
此外还提出了与数据无关的多叉树层次结构模型的知识表示方法，它具有很强的表达能力并易于扩展。
The data-independent multi-branch tree hierarchical structure is proposed for the knowledge representation, because it has strong expressing ability and can be easily expanded.
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