Damien Trog Yan Tang Robert Meersman Towards Ontological Commitments with <i>Omega</i> -RIDL Markup Language. 92-106 2007 conf/ruleml/2007 RuleML http://dx.doi.org/10.1007/978-3-540-75975-1_8 db/conf/ruleml/ruleml2007.html#TrogTM07