return self.element.find('sts:{}'.format(name), _STS_NS).text
            except _ETREE_EXCEPTIONS as error:
                raise InvalidXMLError(
                    ('Invalid XML provided for "{}" - erroring tag <{}>. '
                     'Message: {}').format(self.root_name, name, error.message)
                )
        else:
            return self.element.findtext('sts:{}'.format(name), None, _STS_NS)

    def text(self):