而且它还提供注册中心功能，通过用户定义的属性、关系和分类器来扩展已注册的服务声明和派生内容模型元素。

And it provides registry functions for decorating registered service declarations and elements of the derived content models with user-defined properties, relationships, and classifiers.

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而且它还提供注册中心功能，通过用户定义的属性、关系和分类器来扩展已注册的服务声明和派生内容模型元素。

And it provides registry functions for decorating registered service declarations and elements of the derived content models with user-defined properties, relationships, and classifiers.

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