Thus in the process of constructing digital library, it is necessary to give them user-defined metadata standard.

因而在数字图书馆建设过程中，有必要对其自定义元数据标准。

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The keyword search can be executed on different parameters such as document type, categories, user, and custom metadata defined through the property sheet.

关键词搜索可在不同的参数(比如文档类型、类别、用户和通过属性表定义的定制元数据)上执行。

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Data model extensibility for new data types, and support for system and user defined metadata.

针对新数据类型的数据模型扩展性，支持系统和用户所定义的元数据。

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Adding a comprehensive search feature that uses metadata in addition to user-defined tags, searching "Photos from Thanksgiving" pulls relevant images even if they didn't have those words in the post.

ENGADGET: Path 2.9 update introduces contextualized, personalized search (update: now with video)