Pay as you go Matching of Relational Schemata to OWL Ontologies with IncMap

Ontology Based Data Access (OBDA) enables access to relational data with a complex structure through ontologies as conceptual domain models. A key component of an OBDA system are mappings between the schematic elements in the ontology and their correspondences in the relational schema. Today, in existing OBDA systems these map- pings typically need to be compiled by hand. In this paper we present IncMap, a system that supports a semi-automatic approach for matching relational schemata and ontologies. Our approach is based on a novel matching technique that represents the schematic elements of an ontology and a relational schema in a unied way. Finally, IncMap can extend user-verified mapping suggestions in a pay-as-you-go fashion.