title: graphviz - compare graphic trees
body: <p>I have to do a job with graphviz. I need to visualize the graphic representation of several trees, but in any case I have to compare two tree to see their differences: something like this, I have tree A and tree B. After create their representation and compare them I need to see only the nodes that don't have in common. Someone told me to use EMF Compare but unfortunately I don't know how to make this plugin accept the extension of graphviz.</p>
  
  <p>Any advice or any other possible solution to face this job?</p>
  
  <p>Regards.</p>