Document (#36886)

Author

Schulz, S.
Schober, D.
Tudose, I.
Stenzhorn, H.

Title

¬The pitfalls of thesaurus ontologization : the case of the NCI thesaurus

Issue

Published online 2010 November 13.

Source

AMIA Annual Symposium 2010: Improving Health: Informatics and IT Changing the World: Proceedings

Year

2010

Pages

S.727-731

Abstract

Thesauri that are "ontologized" into OWL-DL semantics are highly amenable to modeling errors resulting from falsely interpreting existential restrictions. We investigated the OWL-DL representation of the NCI Thesaurus (NCIT) in order to assess the correctness of existential restrictions. A random sample of 354 axioms using the someValuesFrom operator was taken. According to a rating performed by two domain experts, roughly half of these examples, and in consequence more than 76,000 axioms in the OWL-DL version, make incorrect assertions if interpreted according to description logics semantics. These axioms therefore constitute a huge source for unintended models, rendering most logic-based reasoning unreliable. After identifying typical error patterns we discuss some possible improvements. Our recommendation is to either amend the problematic axioms in the OWL-DL formalization or to consider some less strict representational format.

Content

Vgl.: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3041372/.

Theme

Wissensrepräsentation

Field

Medizin

Object

NCI Thesaurus

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