Martin Hepp Products and Services Ontologies: A Methodology for Deriving OWL Ontologies from Industrial Categorization Standards. 72-99 2006 2 Int. J. Semantic Web Inf. Syst. 1 http://www.igi-pub.com/articles/details.asp?ID=5577 db/journals/ijswis/ijswis2.html#Hepp06