DAML+OIL for Application Developers

allows us to OR 2 or more classes together, e.g.


<daml:Class rdf:ID="AccessControlIdentity">
  <daml:unionOf rdf:parseType="daml:collection">
    <daml:Class rdf:about="#User"/>
    <daml:Class rdf:about="#Group"/>
  </daml:unionOf>
</daml:Class>