The Getty has a lengthy history in the research and development of thesauri and other structured vocabulary tools to make the use and ex-change of electronic information easier. These tools include the Art & Architecture Thesaurus (1994) (AAT—a thesaurus of art-historical terminology that reflects the "common usage" of scholars and catalogers); the Union List of Artist Names (1994) (ULAN—a database of artist and architect names in both standard and variant forms along with biographical and bibliographic data); and the Thesaurus of Geographic Names (TGN—a thesaurus of worldwide geographic names and related historical and other information organized into hierarchies).
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