OntoWeb Deliverable 4.2: W3C working drafts and recommendations proposing extensions to RDF(S) which is essentially a report on designing OWL in WebOnt by Ian Horrocks, Peter Patel-Schneider, Frank van Harmelen, [
PDF](http://ontoweb.aifb.uni-karlsruhe.de/Members/ruben/Deliverable%204.2), 2003-09-16.