作者: Franz Baader , Carsten Lutz , Sebastian Brandt
DOI:
关键词: Theoretical computer science 、 Envelope (motion) 、 Description logic 、 Mathematics 、 Conjunction (grammar) 、 Axiom 、 Algorithm 、 Set (abstract data type) 、 Value (computer science)
摘要: Recently, it has been shown that the small description logic (DL) EL, which allows for conjunction and existential restrictions, better algorithmic properties than its counterpart FL0, value restrictions. Whereas subsumption problem in FL0 becomes already intractable presence of acyclic TBoxes, remains tractable EL even with general concept inclusion axioms (GCIs). On one hand, we extend positive result by identifying a set expressive means can be added to without sacrificing tractability. other show basically all additions typical DL constructors GCIs make intractable, most cases EXPTIME-complete. In addition, is