title: Research on structural issues of the UMLS--past, present, and future.
authors.forename: Yehoshua
authors.initials: Y
authors.lastname: Perl
authors.forename: James
authors.initials: J
authors.lastname: Geller
mesh_terms: D000043:Abstracting and Indexing / Q000379:methods / Q000639:trends; D001185:Artificial Intelligence; D003628:Database Management Systems; D016208:Databases, Factual / Q000592:standards / Q000639:trends*; D016247:Information Storage and Retrieval / Q000379:methods / Q000639:trends*; D009317:National Library of Medicine (U.S.); D009323:Natural Language Processing; D012106:Research / Q000639:trends*; D012107:Research Design; D012660:Semantics; D009626:Terminology as Topic; D017432:Unified Medical Language System / Q000639:trends*; D014481:United States