XMLTypeInfo xmlTypeInfo = new XMLSave.XMLTypeInfo() {

            @Override
            public boolean shouldSaveType(EClass objectType, EClass featureType, EStructuralFeature feature) {
                return feature.getEContainingClass().getEPackage().equals(CommonPackage.eINSTANCE);
            }

            @Override
            public boolean shouldSaveType(EClass objectType, EClassifier featureType, EStructuralFeature feature) {
                return feature.getEContainingClass().getEPackage().equals(CommonPackage.eINSTANCE);
            }
        };
        Map<String, Object> options = new HashMap<String, Object>();
        options.put(XMLResource.OPTION_SAVE_TYPE_INFORMATION, xmlTypeInfo);
        resource.save(outputStream, options);