def save(self, filename):
        """Write this trigger to gracedb compatible xml format

        Parameters
        ----------
        filename: str
            Name of file to write to disk.
        """
        gz = filename.endswith('.gz')
        ligolw_utils.write_filename(self.outdoc, filename, gz=gz)
Write this trigger to gracedb compatible xml format

        Parameters
        ----------
        filename: str
            Name of file to write to disk.