code: def to_string(self, nspair=None):
          
          if not nspair and self.c_ns_prefix:
              nspair = self.c_ns_prefix
  
          if nspair:
              self.register_prefix(nspair)
  
          return ElementTree.tostring(self._to_element_tree(), encoding="UTF-8")
docs: Converts the Saml object to a string containing XML.
  
          :param nspair: A dictionary of prefixes and uris to use when
              constructing the text representation.
          :return: String representation of the object