提取的元数据包括一些数据模型对象，例如项目类和它们的属性，还有一些管理对象，例如用户定义和访问控制列表。

The extracted metadata includes data model objects, such as item types and their attributes, and administration objects, such as user definitions and access control lists.

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MusicBrainz元数据名称空间涉及核心音乐元数据，它使用了以下类。

The MusicBrainz metadata namespace covers core music metadata, using the following classes.

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在AOP编程中使用元数据将类与方面之间的耦合限制为附加在程序元素上的元数据。

Using metadata in AOP programming limits the coupling between classes and aspects only to the metadata attached to the program elements.

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