docs: def loadFromNode(self, parent, element):
          """element -- DOM node or document
             parent -- WSDLAdapter instance
          """
          reader = self.__readerClass(element)
          schema = XMLSchema(parent)
          #HACK to keep a reference
          schema.wsdl = parent
          schema.setBaseUrl(self.__base_url)
          schema.load(reader)
          return schema