Altova SemanticWorks™ 2007 is the ground-breaking visual RDF/OWL editor from the creators of XMLSpy. Visually design Semantic Web instance documents, vocabularies, and ontologies then output them in either RDF/XML or N-triples formats. SemanticWorks™
S. Bechhofer, R. Volz, and P. Lord. Proc. of the First International Semantic Web Conference 2003 (ISWC 2003), October 21-23, 2003, Sanibel Island, Florida, page 659-675. (2003)