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Regarding links: back about 12 years ago we built a software framework in the (then new) Java language named "Roku". Our ontology in Roku (Japanese for 'six') broke everything into one of six categories (Who, What, When, Where, Why and How).
M. abbas Choudhary M. Asif Naeem. IEEE International Conference on Advanced Computer vision and Information Technology, page 397-405. http://www.itvidya.com/acvit_2007_aurangabad, Department of Computer Science and IT, Dr. B.A.M. U Aurangabad. (MS) India, I. K. International, (December 2007)
A. Arasu, and H. Garcia-Molina. Proceedings of the 2003 ACM SIGMOD International Conference on Management of Data, San Diego, California, USA, June 9-12, 2003, page 337-348. ACM, (2003)