Second , software for utilizing this ontology already exists : MetaMap ( Aronson 2001 ) identifies concepts in free text , and SemRep ( Rindflesch and Fiszman 2003 ) extracts relations between the concepts .
the interaction of domain knowledge and linguistic structure in natural language processing interpreting hypernymic propositions in biomedical text
Thomas C Rindflesch Marcelo Fiszman
First , substantial understanding of the domain has already been codified in the Unified Medical Language System ( UMLS ) ( Lindberg , Humphreys , and McCray 1993 ) . Second , software for utilizing this ontology already exists : MetaMap ( Aronson 2001 ) identifies concepts in free text , and SemRep ( Rindflesch and Fiszman 2003 ) extracts relations between the concepts . Both systems utilize and propagate semantic information from UMLS knowledge sources : the Metathesaurus , the Semantic Network , and the SPECIALIST lexicon .
Second , software for utilizing this ontology already exists : MetaMap ( Aronson 2001 ) identifies concepts in free text , and SemRep ( @@CITATION ) extracts relations between the concepts .