Marcel Ball Harold Boley David Hirtle Jing Mei Bruce Spencer Implementing RuleML Using Schemas, Translators, and Bidirectional Interpreters. 2005 conf/w3c/2005r Rule Languages for Interoperability http://www.w3.org/2004/12/rules-ws/paper/49 db/conf/w3c/rules2005.html#BallBHMS05