492 citations
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4 papers · 1 filter
Combining Rewriting and Incremental Materialisation Maintenance for Datalog Programs with Equality
Boris Motik, Yavor Nenov, Robert Piro +1
Materialisation precomputes all consequences of a set of facts and a datalog program so that queries can be evaluated directly (i.e., independently from the program). Rewriting opt…
Handling owl:sameAs via Rewriting
Boris Motik, Yavor Nenov, Robert Piro +1
Rewriting is widely used to optimise owl:sameAs reasoning in materialisation based OWL 2 RL systems. We investigate issues related to both the correctness and efficiency of rewriti…
The Ontological Key: Automatically Understanding and Integrating Forms to Access the Deep Web
Tim Furche, Georg Gottlob, Giovanni Grasso +3
Forms are our gates to the web. They enable us to access the deep content of web sites. Automatic form understanding provides applications, ranging from crawlers over meta-search e…
Conjunctive Queries over Trees
Georg Gottlob, Christoph Koch, Klaus U. Schulz
We study the complexity and expressive power of conjunctive queries over unranked labeled trees represented using a variety of structure relations such as ``child'', ``descendant''…