def _transform_row(self, in_row, out_row):
tmp_row = {}<EOL>for step in self._steps:<EOL><INDENT>park_info, ignore_info = step(in_row, tmp_row, out_row)<EOL>if park_info or ignore_info:<EOL><INDENT>return park_info, ignore_info<EOL><DEDENT><DEDENT>return None, None<EOL>
Transforms an input row to an output row (i.e. (partial) dimensional data).

:param dict[str,str] in_row: The input row.
:param dict[str,T] out_row: The output row.

:rtype: (str,str)