title: how to convert uml2 file (*.uml) to xmi file?
body: <p>I created a .uml file by Eclipse uml2 tools,
  but how can I convert the .uml file to .xmi file so that I can import the .xmi file to other uml case tool.</p>
  
  <p>should I convert .uml to .ecore(EMF model), and then use org.eclipse.emf.ecore.xmi.util.XMLProcessor.save() to save as xmi file?</p>
  
  <p>Thanks.</p>