只有语义上表实体的处所成分才能被关系化；
Only the element of place that means a specific entity in semantics is relational.
语义数据模型提供了表达设计实体及其相互依赖关系的一体化方法。
By the semantic data model, an integration method to express design entities and their interdependence is provided.
语义关联是语义数据模型中实体之间二维关系的知识表示形式。
Semantic association is defined as the representation of rich knowledge about binary relation in semantic data model.
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