The use of ontologies and ontology languages like OWL has attracted much attention, mainly in the Semantic Web research field. In this paper we focus on the problem of automating the generation of domain ontologies, at least partially, by applying reverse engineering technique. We present the complete details of the process of semi-automatically creating an OWL ontology that corresponds to the content of a relational database based on the analysis of its related HTML-forms. The main reason for this construction is to make the relational database information that is available on the Web machine-processable and reduce the time consuming task of ontology creation. Copyright © 2007 by the International Society for Computers and Their Applications (ISCA).