Metadata management

Linnaean taxonomy, a metadata system used historically for grouping animals in zoos, first published in 1735
Card catalog and digital media access point

Metadata management involves managing metadata about other data, whereby this "other data" is generally referred to as content data. The term is used most often in relation to digital media, but older forms of metadata are catalogs, dictionaries, and taxonomies. For example, the Dewey Decimal Classification is a metadata management system developed in 1876 for libraries.