Zhang L, Perl Y, Halper M, Geller J,
Cimino JJ.
An
enriched unified medical language system semantic
network with a multiple subsumption hierarchy.
J Am Med Inform Assoc. 2004 May-Jun;11(3):195-206. Epub
2004 Feb 5.
Abstract: Objective:
The Unified Medical Language System (UMLS) Semantic
Network (SN) two-tree structure is restrictive because
it does not allow a semantic type to be a specialization
of several other semantic types. In this paper, the SN
is expanded into a multiple subsumption structure with a
directed acyclic graph (DAG) IS-A hierarchy, allowing a
semantic type to have multiple parents. New viable IS-A
links are added as warranted. |
