m =< e 1 , e 2 , r, k > (1) Similar with most of the OAEI systems (Li et al., 2009; Ngo and Bellahsene, 2012; Cheatham and Hitzler, 2013b), we focus on discovering only equivalent mappings between classes and properties with cardinality 1:1.
one class (property) in ontology O 1 can be matched to at most one class (property) in ontology O 2 and vise versa.