<AssignMessage name='AM-AssignVariable-RefWithCurlies'>
  <IgnoreUnresolvedVariables>false</IgnoreUnresolvedVariables>
  <AssignVariable>
    <!-- the Ref element should contain a variable name not
         surrounded by curlies -->
    <Name>my_variable</Name>
    <Ref>{system.id}</Ref>
  </AssignVariable>

</AssignMessage>
