

<owl:ObjectProperty rdf:ID="header">
  <rdfs:label>header</rdfs:label>
  <rdfs:comment>
    A message envelope contains the message headers
  </rdfs:comment>
  <rdfs:domain rdf:resource="Message_Envelope"/>
  <!-- <rdfs:range rdf:resource="Message_Header"/> HERE -->
</owl:ObjectProperty>


<owl:Class rdf:ID="Message_Exchange_Pattern">
  <rdfs:label>Message_Exchange_Pattern</rdfs:label>
  <rdfs:comment>
    A Message Exchanage Pattern (MEP) is a template, devoid of
    application semantics, that describes a generic pattern for the
    exchange of messages between agents. It describes the temporal and
    causal relationships, if any, of multiple messages exchanged in
    conformance with the pattern, as well as the normal and abnormal
    termination of any message exchange conforming to the pattern.
  </rdfs:comment>
</owl:Class>