指的是提供有关在hub模型内定义的实体成员信息的数据存储。
Refers to data stores that provide information about entity members defined in the hub model.
它试图描述或者设置存在的基本范畴和关系，以便在其框架内定义各实体和各实体的一些类型。
It seeks to describe or posit the basic categories and relationships of being or existence to define entities and types of entities within its framework.
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