14. A computer system providing on-demand creation and extension of ontology, in an ontology use process, comprising: support means for responding to a creation event in the ontology use process, the support means defining ontology specification for a newly created item, in the creation event, in a manner substantially free of disruption to the ontology use process, the ontology use process having one or more semantic models modeling meaning of information and situations, wherein the models are any of a graphical representation and text representation; and incorporation means for incorporating the defined ontology specification into an ontology as needed during the ontology use process such that an on-demand extension of the ontology results, the ontology defining a hierarchy of concept classes and relationships that may exist on instances of the classes in the models.
14. A computer system providing on-demand creation and extension of ontology, in an ontology use process, comprising: support means for responding to a creation event in the ontology use process, the support means defining ontology specification for a newly created item, in the creation event, in a manner substantially free of disruption to the ontology use process, the ontology use process having one or more semantic models modeling meaning of information and situations, wherein the models are any of a graphical representation and text representation; and incorporation means for incorporating the defined ontology specification into an ontology as needed during the ontology use process such that an on-demand extension of the ontology results, the ontology defining a hierarchy of concept classes and relationships that may exist on instances of the classes in the models. 15. A computer system as claimed in claim 14 wherein the ontology use process is any of a semantic web process, a knowledge representation editor, a user interactive design tool, a modeling too, a business intelligence package and an analysis support package.