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Descriptive metadata is typically used for discovery and identification, as information to search and locate an object, such as title, author, subjects, keywords, publisher.Structural metadata describes how the components of an object are organized.In these fields the word metadata is defined as "data about data".While this is the generally accepted definition, various disciplines have adopted their own more specific explanation and uses of the term.An example of structural metadata would be how pages are ordered to form chapters of a book.Finally, administrative metadata gives information to help manage the source.
Technical metadata corresponds to internal metadata, and business metadata corresponds to external metadata. On the other hand, NISO distinguishes among three types of metadata: descriptive, structural, and administrative.
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A CD may include metadata providing information about the musicians, singers and songwriters whose work appears on the disc.
A principal purpose of metadata is to help users find relevant information and discover resources.