Glossary about Controlled Vocabularies tematres thesaurus, thesauri, information retrieval, controlled vocabularies, glossary, definitions, structured vocabularies, facets, faceted classification 1998-12-31 2011-12-13 10:39:06 en reserved characters Letters, numbers, or symbols that have special uses or meanings in a programming or querying language 2011-08-16 23:06:52