Issue - 85 - Multiple links with the same source and target

<flow ...>
     <links>
       <link name="AtoB-1"/>
       <link name="AtoB-2"/>
     </links>
     <invoke name="A" ...>
       <source linkName="AtoB-1" transitionCondition="P1"/>
       <source linkName="AtoB-2" transitionCondition="P2"/>
       ...
      </invoke>
     <invoke name="B" ...>
       <target linkName="AtoB-1"/>
       <target linkName="AtoB-2"/>
       ...
     </invoke>
   </flow>