@property<EOL><INDENT>def tag(self):<DEDENT>
return self._tag<EOL>
The tag (name) associated with this flag.

        This should take the form ``'AAA-BBB_CCC_DDD'``, i.e. where
        each component is an uppercase acronym of alphanumeric
        characters only, e.g. ``'DCH-IMC_BAD_CALIBRATION'`` or
        ``'DMT-SCIENCE'``.

        :type: `str`