我刚刚开始学习lxml基础知识，但我对namespace感到困惑:我需要生成这样的xml:1000通过使用以下代码:fromlxmlimportetreecityModel=etree.Element("cityModel")cityObject=etree.SubElement(cityModel,"cityObjectMember")bldg=etree.SubElement(cityObject,"{http://schemas.opengis.net/citygml/building/2.0/building.xsd}bldg")function=etree.SubElemen