Anti-Unification of Concepts in Description Logic EL

We study anti-unification for the description logic EL and introduce thenotion of least general generalisation, which generalises simultaneously leastcommon subsumer and concept matching. The idea of generalisation of twoconcepts is to detect maximal similarities between them, and to abstract overtheir differences uniformly. We demonstrate that a finite minimal complete setof generalisations for ELconcepts always exists and establish complexitybounds for computing them. Wepresent an anti-unification algorithm that computes generalisations with afixed skeleton, study its properties and report on preliminary experimental evaluation.