Martin Ph. and Eklund P. (2002). Manageable Approaches to the Semantic Web.
"Practice & Experience" alternate track of the WWW 2002, 11th International World Wide Web Conference, Honolulu, Hawaii, USA, May 7-11, 2002.

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A slightly extended and refined version of this article (33p) has been turned into a chapter for a book entitled "Web Intelligence".

PDF version.     Postscript version.

Also see this complementary article about how knowledge can be represented in (or translated from/to) RDF/XML, KIF, Frame-CGs, Formalized English and CGIF.