DescriptionElement descEl = factory.newDescription();
Description descComp = descEl.toComponent();
descEl.setTargetNamespace(namespace1);
InterfaceImpl interfac = (InterfaceImpl)descEl.addInterfaceElement();
interfac.setName(name1);
InterfaceImpl interfac2 = (InterfaceImpl)descEl.addInterfaceElement();
interfac2.setName(name2);
InterfaceImpl interfac3 = (InterfaceImpl)descEl.addInterfaceElement();
interfac3.setName(name3);
interfac.addExtendedInterfaceName(interfac.getName());
interfac.addExtendedInterfaceName(interfac2.getName());