RuleML DTDs: release 0.8
<_opr><rel href="http://www.eeebizz.com/rdf-sch#Approval"/></_opr>
<ind href="http://www.eeebico.org/docs/joint-mission.html"/>
Advantage of roles is object-centered modeling: If some item is to be added to a fact or atom, then this is easy to attach, RDF-like
Item insertion, XML-like, into child sequence would cause all subsequent children to assume a new position (problem for XSLT)