modeltype OUTMODEL uses 'http://www.eclipse.org/mm/outmodel';
modeltype INMODEL uset 'http://www.eclipse.org/mm/inmodel';

transformation perform_process(in inputModel : INMODEL, out firstOutModel : OUTMODEL, out secondOutModel : OUTMODEL);

main() {
   var inRoot : Letter := inputModel.rootObjects()![Letter];
   inRoot.map toFirstOut(firstOutModel);
   inRoot.map toSecondOut(secondOutModel);
}

mapping Letter : toFirstOut(inout outM : OUTMODEL ){
	object Person{ name:= self.name};
}

mapping Letter : toSecondOut(inout outM : OUTMODEL){
	object Person{ name:= self.name + " Lukes"};
}

modeltype OUTMODEL1 uses 'http://www.eclipse.org/mm/outmodel';
modeltype OUTMODEL2 uses 'http://www.eclipse.org/mm/outmodel';

import inner;

modeltype ECORE uses "http://www.eclipse.org/emf/2002/Ecore";

transformation outer(out outModel : ECORE, out outModel2 : ECORE);

main() {
	/* Executes inner transformation which creates root element in outModel2.
         * Consider using .transform().failed() to check if the transformation has
         * finished properly. */
	new inner(outModel2).transform();

	/* Creates new EPackage to outModel */
	object EPackage { name := "outer" };
	
	/* Objects from outModel2 can be further updated... */ 
	var innerPackage : EPackage = outModel2.rootObjects()![EPackage]; 
	innerPackage.name := "updated inner";

	/* ... and new instances can be placed into the model as well. */	
	innerPackage.eSubpackages += object EPackage { name := "inner, inner" }
}

modeltype ECORE uses "http://www.eclipse.org/emf/2002/Ecore";

transformation inner(out outModel : ECORE);

main() {
	object EPackage { name := "inner" };
}