采用元数据组织管理的三层体系结构：元数据子集、元数据实体和元数据元素。
The three metadata structure of organizational management was adopted: metadata section, metadata entity, and metadata element.
采用元数据组织管理的三层体系结构：元数据子集、元数据实体和元数据元素。
The three metadata structure of organizational management was adopted: metadata section, metadata entity, and metadata element.
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