title: Publish message on multiple topic strings (IBM Integration Bus)
body: <p>I've a scenario where I would receive message using MQ Input node and based on the value of source system present in the message, I need to form topic string and publish the message. This is how my flow looks like: </p>
  
  <p>MQInput -> Compute -> Publication </p>
  
  <p>And I populate the value of Topic using: 
  SET OutputRoot.Properties.Topic = 'TopicName/' || sourceName ; </p>
  
  <p>This works fine in case message contains one source system. </p>
  
  <p>However there is possibility that message contain multiple source system. Is it possible to use the above mentioned command to publish the messages on multiple topic string? (something like this) </p>
  
  <p>SET OutputRoot.Properties.Topic = 'Topic/' || sourceName1 ; </p>
  
  <p>SET OutputRoot.Properties.Topic = 'Topic/' || sourceName2 ; </p>
  
  <p>Appreciate any suggestions.</p>