This file stores a top-level ontology of concept types and relations types (cf. the rationales for this ontology). If you have a Javascript-enabled browser, you might be able to use our hierarchy browser (which unfortunately pushes Javascript to its limits of window handling and portability) to visualize and navigate the concept types Isa hierarchy and the relation types Isa hierarchy that are in textual form below.

You may save this file on your local disk ("File - Save As" command on Netscape) and
then modify this ontology for your needs.