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IJCAI
2003

Terminological Cycles in a Description Logic with Existential Restrictions

11 years 1 months ago
Terminological Cycles in a Description Logic with Existential Restrictions
Cyclic definitions in description logics have until now been investigated only for description logics allowing for value restrictions. Even for the most basic language which allows for conjunction and value restrictions only, deciding subsumption in the presence of terminological cycles is a PSPACE-complete problem. This paper investigates subsumption in the presence of terminological cycles for the language . , which allows for conjunction, existential restrictions, and the topconcept. In contrast to the results for , subsumption in remains polynomial, independent of whether we use least fixpoint semantics, greatest fixpoint semantics, or descriptive semantics.
Franz Baader
Added 31 Oct 2010
Updated 31 Oct 2010
Type Conference
Year 2003
Where IJCAI
Authors Franz Baader
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