Notation3 as an Existential Rule Language

Vortrag von Dörthe Arndt

Veranstaltungsort: APB 3027
Beginn: 16. November 2023 um 11:00
Ende: 16. November 2023 um 12:00
Event series: Research Seminar Logic and AI
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Abstract: Notation3 Logic (N3) is an extension of RDF that allows the user to write rules introducing new blank nodes to RDF graphs. Many applications (e.g., ontology mapping) rely on this feature as blank nodes – used directly or in auxiliary constructs – are omnipresent on the Web. However, the number of fast N3 reasoners covering this very important feature of the logic is rather limited. On the other hand, there are engines like VLog or Nemo which do not directly support Semantic Web rule formats but which are developed and optimized for very similar constructs: existential rules. In this paper, we investigate the relation between N3 rules with blank nodes in their heads and existential rules. We identify a subset of N3 that can be mapped directly to existential rules and define such a mapping preserving the equivalence of N3 formulae. In order to also illustrate that in some cases N3 reasoning could benefit from our translation, we then employ this mapping in an implementation to compare the performance of the N3 reasoners EYE and cwm to VLog and Nemo on N3 rules and their mapped counterparts. Our tests show that the existential rule reasoners perform particularly well for use cases containing many facts while especially the EYE reasoner is very fast when dealing with a high number of dependent rules. We thus provide a tool enabling the Semantic Web community to directly use existing and future existential rule reasoners and benefit from the findings of this active community.

The talk will take place in a hybrid fashion, physically in the APB room 3027, and online through the link:

https://bbb.tu-dresden.de/b/pio-zwt-smp-aus