Ontology Alignment Evaluation Initiative - OAEI-2011 CampaignOAEI

A note about handling SKOS

Ontology matchers tend to require ontologies to be matched (this is the least). Yet SKOS thesauri are not really ontologies. There are a few options for handling this.

Direct handling of SKOS

Since version 4.1 (or the current version under svn), the Alignment API is able to handle SKOS thesauri thanks to its Ontology wrapper and the SKOS API or our own Lite SKOS wrapper (advised).

Both wrappers allow for presenting a SKOS thesaurus as an ontology under the Ontowrap abstract API.

Using the Alignment API integrated SKOSAPI (SKOSLite)

In order to use the SKOS Lite wrapper, it is sufficient to set the default factory to the SKOSLite one, and ontowrap will use it. For this purpose, begin your code with:

fr.inrialpes.exmo.ontowrap.OntologyFactory.setDefaultFactory( "fr.inrialpes.exmo.ontowrap.skoslite.SKOSLiteOntologyFactory" );
Of course, the thesauri will have to be manipulated through the ontowrap API.

Using the Manchester SKOS API (working but obsolete)

There are two reasons not to use this wrapper: it is four times slower than SKOSLite and it relies on an old version of the OWL API (at the time of writing). There is one reason to use it: it may be more complete than the SKOSLite interface. But in this case, it may be preferable to use it out of ontowrap.

The main problem for using the alignment API with the SKOS API is that the SKOS API is using an intermediate version of the OWL API (2.0), which is incompatible with the first one (1.0), instead of the last one (3.0).

To solve this:

Translation from SKOS to OWL

People may want to translate SKOS thesauri into OWL ontologies. We are aware of at least two ways to achieve this.

Use the converted ontologies provided for the food, environment and library test sets. According to the description provided by Antoine Issac (older version here), they obey the following rules:

Use the tool developed by Miklos Nagy for the same purpose. It uses the following set of rules (see also Miklos provided short description):

Antoine also plans to evaluate alignments that use OWL properties as mapping links. The following interpretations will be made of OWL data sent back by participants: