'Print out a Mace4 model using any Mace4 ``interpformat`` format.
See http://www.cs.unm.edu/~mccune/mace4/manual/ for details.
:param valuation_str: str with the model builder\'s output
:param format: str indicating the format for displaying
models. Defaults to \'standard\' format.
:return: str'

def _decorate_model(self, valuation_str, format):

    if (not format):
        return valuation_str
    elif (format == 'valuation'):
        return self._convert2val(valuation_str)
    else:
        return self._transform_output(valuation_str, format)
