业务实体是概念数据模型的基本构建块。
Business entities are the fundamental building block of the conceptual data model.
由于逻辑或物理模型是现实中的系统的抽象，它通常非常复杂，由很多构建块和关系组成。
Because a logical or physical model is an abstraction of the real-world system, it is usually very complicated, and it consists of many building blocks and relationships.
Registry and Repository内容模型的最基本构建块是服务元数据构件文档(物理文档)，如xsd或wsdl文件。
The most elemental building blocks for the Registry and Repository content model are service metadata artifact documents (physical documents), such as XSD or WSDL files.
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