Thomas F. Gordon Guido Governatori Antonino Rotolo Rules and Norms: Requirements for Rule Interchange Languages in the Legal Domain. 282-296 2009 RuleML http://dx.doi.org/10.1007/978-3-642-04985-9_26 conf/ruleml/2009 db/conf/ruleml/ruleml2009.html#GordonGR09