"Concept Scheme" . "A set of concepts, optionally including statements about semantic relationships between those concepts." . "2008-05-xx" . . _:vb898432 . . . "Thesauri, classification schemes, subject heading lists, taxonomies, 'folksonomies', and other types of controlled vocabulary are all examples of concept schemes. Concept schemes are also embedded in glossaries and terminologies." . . "A concept scheme may be defined to include concepts from different sources." . . . .