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2015 | OriginalPaper | Buchkapitel

On the Krom Extension of \(\mathcal {CFDI}^{\forall -}_{nc}\)

verfasst von : David Toman, Grant Weddell

Erschienen in: AI 2015: Advances in Artificial Intelligence

Verlag: Springer International Publishing

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Abstract

We consider the consequences on basic reasoning problems of the Krom extension to the description logic dialect \(\mathcal {CFDI}^{\forall -}_{nc}\), that is, of allowing negated primitive concepts on left-hand-sides of inclusion dependencies. Specifically, we show that TBox consistency and concept satisfiability remain in PTIME, but that this extension leads to intractability for both knowledge base consistency and instance retrieval. We then trace the roots of intractability by presenting tight conditions that recover PTIME complexity for both of these problems. The conditions relate to the structure of functional constraints in \(\mathcal {CFDI}^{\forall -}_{nc}\) and to the unique name assumption.

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Fußnoten
1
The widgets, in principle, can support 4-clauses. For 3-CNF we fixed concept membership of one of the objects to B.
 
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Metadaten
Titel
On the Krom Extension of
verfasst von
David Toman
Grant Weddell
Copyright-Jahr
2015
DOI
https://doi.org/10.1007/978-3-319-26350-2_50