Recently, there is an increasing interest in the problem of mapping relational databases to RDF and OWL. Some theoretical work has been done to deal with this problem. However, there is no system implemented to allow the users to extract ontologies from real databases and provide visualization of the extracted ontology together with the mapping between the ontology and the relational database. In this paper, we take the first step to provide a system for extracting OWL ontologies from relational databases and allowing the users to manually edit the extracted ontologies. Furthermore, our system supports visualization of ontologies and the mapping between ontologies and relational databases. Unlike existing ontology editors, our system is implemented by Jquery and can be run in Web browsers.
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