元數據是關于數據的組織、數據域及其關系的信息，簡言之，元數據就是關于數據的數據。

Metadata?is "data?[information] that provides information about other data".^[1]?Many distinct types of metadata exist, among these?descriptive metadata,?structural metadata,?administrative metadata^[2],?reference metadata?and?statistical metadata^[3]

• Descriptive metadata describes a resource for purposes such as discovery and identification. It can include elements such as title, abstract, author, and keywords.
• Structural metadata is metadata about containers of data and indicates how compound objects are put together, for example, how pages are ordered to form chapters. It describes the types, versions, relationships and other characteristics of digital materials.?^[4]

描述元數據和結構元數據。

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https://en.wikipedia.org/wiki/Metadata#cite_note-4

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元數據（Metadata），又稱中介數據、中繼數據，為描述數據的數據（data about data），主要是描述數據屬性（property）的信息，用來支持如指示存儲位置、歷史數據

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