Description Logic Rules
Krötzsch Markus, Rudolph Sebastian, Pascal Hitzler ยท Frontiers in artificial intelligence and applications ยท 2008
We introduce description logic (DL) rules as a new rule-based formalism for knowledge representation in DLs. As a fragment of the Semantic Web Rule Language SWRL, DL rules allow for a tight integration with DL knowledge bases. In contrast to SWRL, however, the combination of DL rules with expressive description logics remains decidable, and we show that the DL ๐ฎโ๐ชโ๐ฌ โ the basis for the ongoing standardisation of OWL 2 โ can completely internalise DL rules. On the other hand, DL rules capture many expressive features of ๐ฎโ๐ชโ๐ฌ that are not available in simpler DLs yet. While reasoning in ๐ฎโ๐ชโ๐ฌ is highly intractable, it turns out that DL rules can be introduced to various lightweight DLs without increasing their worst-case complexity. In particular, DL rules enable us to significantly extend the tractable DLs โฐโ++and DLP.