If you are interested in developing your own Semantic Web ontology or application, you may wish to check out TopBraid Composer.  Here you may download their data sheet which describes TopBraid and what it can do.  Even Nova Spivack, of Radar Networks apparently uses TopBraid, as he is quoted on the site as using the product. You may download the product for a 30 day trial to use it.  Afterward ... Continue reading