how to convert uml2 file (*.uml) to xmi file?

[solidcrowbar]

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.should I convert .uml to .ecore(EMF model), and then use org.eclipse.emf.ecore.xmi.util.XMLProcessor.save() to save as xmi file?Thanks.