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Ontologies are used in numerous research disciplines and commercial applications to uniformly and semantically annotate real-world objects. Often there are multiple interrelated ontologies in a domain, and repositories such as BioPortal already provide mappings (links) between these ontologies. Especially manually verified mappings can be reused 1) to create new mappings between so far unconnected sources, and 2) to avoid an expensive re-identification, e.g. when the underlying ontologies change.
New ontology mappings can be determined by reusing and composing previously determined mappings that involve intermediate ontologies. The composition of mappings is very efficient and can achieve mappings of very high quality especially for valuable intermediate ontologies. Moreover, due to a rapid development of application domains, ontologies are frequently changed to include up-to-date knowledge. These changes dramatically influence dependent data as well as applications like ontology mappings and ontology-based annotations. Thus existing mappings may become invalid and need to be migrated to the most recent ontology versions, such that users and dependent applications can consume up-to-date mappings.
In this talk, I will give a brief introduction to ontology mappings and provide an overview on reuse-based approaches for mapping creation and maintenance, currently studied at the Database Group at Leipzig University.