@property<EOL><INDENT>def formula(self):<DEDENT>
if self._reader._level == <NUM_LIT:3>:<EOL><INDENT>for ns in (FBC_V2, FBC_V1):<EOL><INDENT>formula = self._root.get(_tag('<STR_LIT>', ns))<EOL>if formula is not None:<EOL><INDENT>return formula<EOL><DEDENT><DEDENT><DEDENT>return None<EOL>
Species formula