MEDLEY results for OAEI 2012

MEDLEY is an alignment method based on lexical and structural treatments. This method includes a specific technique to deal with multilingual ontologies. This paper introduces MEDLEY and summarizes the results for OAEI 2012. 1 Presentation of the system MEDLEY can be presented as an OWL ontology alignment method that relies on simple similarity metrics. Each ontology pair, can be transformed into graphs structures. This means that links are OWL primitives and nodes are classes, properties, and individuals. The algorithm includes a lexical, structural treatment. Each node can be matched with few ones, then MEDLEY select pairs that maximize the global similarity value. 1.1 State, purpose, general statement MEDLEY generates alignments between OWL-DL ontologies based on simple lexical metrics and structures matching between links of each node (class, property, instance). Specific treatment is applied for multilinguality issue, using a dictionnary to find equivalence between concepts labelled in diffrent natural languages. 1.2 Specific techniques used Each entity in the first ontology is aligned each entity in the second, in a primary step, in lexical metrics, then in structural treatment. The algorithm reiterate this process for all ontologies’s concepts. – Lexical treatment : q-gram [1] and levenshtein [2] measures were used to calculate the similarity measures between nodes. In addition, treatments and tokenization stemmatisation were conducted. – Structural treatment :If an entity belongs to a given ontology has a neighbor that is already part of the alignment set, then the node that neighbor is aligned to must be a neighbor of any prospective match for this entity. 1.3 Adaptations made for the evaluation The MEDLEY method deals with three test suites used in the Ontology Alignment Evaluation Initiative (OAEI 2012). The method was wrapped in a certain folder structure to be evaluated locally after being integrated in the SEALS platform. The package contains all the libs files required by the method and a zipped .jar file that acts as a bridge. 1.4 Link to the system and parameters file The release of the MEDLEY method and the parameter file used for OAEI 2012 are located at https://github.com/medley.