Michael Schroeder, Gerd Wagner (Eds.): Rules and Rule Markup Languages for the Semantic Web, Second International Workshop, RuleML 2003, Sanibel Island, FL, USA, October 20, 2003, Proceedings. Springer 2003 Lecture Notes in Computer Science ISBN 3-540-20361-3
Harold Boley: Object-Oriented RuleML: User-Level Roles, URI-Grounded Clauses, and Order-Sorted Terms. 1-16