code: @Override
  	public EObject create(EClass eClass)
  	{
  		switch (eClass.getClassifierID())
  		{
  			case XtypePackage.XFUNCTION_TYPE_REF: return createXFunctionTypeRef();
  			case XtypePackage.XCOMPUTED_TYPE_REFERENCE: return createXComputedTypeReference();
  			case XtypePackage.XIMPORT_SECTION: return createXImportSection();
  			case XtypePackage.XIMPORT_DECLARATION: return createXImportDeclaration();
  			default:
  				throw new IllegalArgumentException("The class '" + eClass.getName() + "' is not a valid classifier");
  		}
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated