override void doGenerate(
			ResourceSet input,
			Iterable<URI> urlsToBuild )
	{
		/*
		 * Get all models from all resources.
		 * urlsToBuild contains all URIs of own model files to use for this run
		 */
		val resources = urlsToBuild.map( url | input.getResource( url, true ) )
		
		/*
		 * Call resolveAll to avoid late errors with yet unresolved proxies
		 * (seems to be important before copyAll)
		 */
		for (r : resources) EcoreUtil2::resolveAll( r )
		
		/*
		 * Get models to build from resources
		 */
		val originalModels = resources.map( res | res.contents ).flatten
							  .filter( typeof( Model ) )
							  .toList // needed to avoid ConcurrentModificationException
		
		/*
		 * Clone content to new XtextResource
		 */
		// creating a totally new XtextResourceSet is not working cause all the additional Xtext related resources are missing then
		//		val tempResourceSet = xtextResourceSetProvider.get
		//		val tempResource = xbaseResourceProvider.get

		// create temporary resource
		val tempResource = input.createResource( URI::createPlatformResourceURI( "tempModel.dsl", false ) ) as XbaseResource
		
		// put all models in new list to prepare and scope copyAll
		val copyObjects = <AbstractElement>newArrayList()
		copyObjects.addAll( originalModels.map( e | e.elements ).flatten )
		
		// do the copy // TODO here we still have links to old models!
		val copiedObjects = EcoreUtil::copyAll( copyObjects )
		
		// create new model, add to temp resource and add copied objects to it
		val model = factory.createModel
		tempResource.contents.add( model )
		model.elements.addAll( copiedObjects )
		
		// trigger associator and inferrer
		tempResource.installDerivedState( false )
		
		// get the new model as a list to do generation
		val models = newArrayList( model )