title: (DOORS/DXL)Update a DOORS module with info in other module
body: <p>I'm new to DXL Language.
  That's my question: I'd like to update a DOORS module (MODULE A) by inserting (or update), in an <em>exact</em> point of the module tree, some rows that are in another DOORS module (MODULE B).</p>
  
  <p>Infact I'd like to modify a <em>small</em> part of the entire module (MODULE A) in Excel, then import this part in a module (MODULE B) and then make the merge between the two modules.<br>
  Thank you all!</p>