code: def get_child_text(self, name, strict=True):
          
          if strict:
              try:
                  return self.element.find('s3:{}'.format(name), _S3_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('s3:{}'.format(name), None, _S3_NS)
docs: Extract text of a child element. If strict, and child element is
          not present, raises InvalidXMLError and otherwise returns
          None.