Structured information used to describe information resources/objects for a variety of
purposes. Although AACR2/MARC cataloguing is formally metadata, the term is generally
used in the library community for non-traditional schemes such as the Dublin Core Metadata
Element Set, the VRA Core Categories, or the Encoded Archival Description (EAD). Metadata
can be categorized as descriptive, structural, and administrative. (Reitz, 2004, p. 448)