@property<EOL><INDENT>def _selection_name(self):<DEDENT>
if self._selection is None:<EOL><INDENT>return None  <EOL><DEDENT>else:<EOL><INDENT>return self._selection<EOL><DEDENT>
return a name for myself; this would ideally be called
the 'name' property, but we cannot conflict with the
Series.name property which can be set