13. A method as in claim 12 , wherein the step (B) of defining said feature set comprises identifying significant synsets of said each ontology file, each synset representing a domain in an ontology file.
13. A method as in claim 12 , wherein the step (B) of defining said feature set comprises identifying significant synsets of said each ontology file, each synset representing a domain in an ontology file. 14. A method as in claim 13 , wherein the step (C) of identifying said domain further comprises collecting statistics of discovered domains, collected said statistics selecting said categories representing said generated ontology files, collected said statistics providing metrics for measuring the effectiveness of category discovery.