# Ontology Alignment

![0_Image_0.Png](0_Image_0.Png)

![0_Image_1.Png](0_Image_1.Png) At The Instance And Schema Level

Fabian M. Suchanek∗, Serge Abiteboul†**, Pierre Senellart**‡
Domaine : Algorithmique, programmation, logiciels et architectures Équipe-Projet Webdam Rapport technique n° 0408 - version 2 - initial version May 2011 - revised version August 2011 - 23 pages Abstract: **We present PARIS, an approach for the automatic alignment of**
ontologies. PARIS aligns not only instances, but also relations and classes.

Alignments at the instance-level cross-fertilize with alignments at the schemalevel. Thereby, our system provides a truly holistic solution to the problem of ontology alignment. The heart of the approach is probabilistic. This allows PARIS to run without any parameter tuning. We demonstrate the efficiency of the algorithm and its precision through extensive experiments. In particular, we obtain a precision of around 90% in experiments with two of the world's largest ontologies.

Key-words: **Alignment, Ontology, Disambiguation, RDFS, Instances, Relations**
This work has been partially funded by the ERC grant Webdam.

∗ **INRIA Saclay, 4 rue Monod, 91400 Orsay, France (fabian@suchanek.name)** x
† **LSV, 61, avenue du Président Wilson, 94230 Cachan, France (serge.abiteboul@inria.fr)** x
‡ Télécom ParisTech, 46 rue Barrault, 75013 Paris, France (pierre@senellart.com) x Centre de recherche INRIA Saclay - Île-de-France Parc Orsay Université 4, rue Jacques Monod, 91893 ORSAY Cedex Téléphone : +33 1 72 92 59 00