I think it is useful to think of four sources of descriptive metadata in libraries.

我觉得把图书馆中的描述性元数据分为四类对于我们不无裨益。

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Descriptive metadata may include information about the content and form of the materials.

著录元数据包括内容和资料形式的相关信息。

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SOA USES the descriptive metadata associated with the service description across the service life cycle.

SOA在整个服务生命周期中使用与服务描述相关联的描述性元数据。

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These APIs enable the recognition of music from text lookups, CDs, digital files and audio captured with a mobile device, and returns descriptive metadata for more than 2, 000 music genres and sub-genres, artist origins, and more than 100 music moods.

ENGADGET: Gracenote unleashes its vast musical know-how to developers