Integration of information from different ontologies

In this work we describe our approach directed to the integration of information from different ontologies. We propose a method to extract and integrate modules from ontologies. These modules are generated as subgraphs from original ontologies on the basis of a term defined by the user. The module extraction is related to the view traversal method [1]. The difference is that we not only extract modules from OWL ontologies but use these modules for further integration. The small modules are integrated to one graph structure on basis of mappings. These mappings are based on the similarity between concepts in different ontologies. With these mappings we introduce merged nodes in the integrated graph which connect concepts from different ontologies. The integrated graph can be considered as a view or as a query answer and contains information collected from different ontologies. The method can also be useful to check the correctness of the mappings, because the user can see whether the merged concept is correctly placed in the hierarchy.