'Check the request for a transformable format
@param method: "import" for import methods, else None'

def transformable(self, method=None):

    if (self.representation in ('html', 'aadata', 'popup', 'iframe')):
        return False
    stylesheet = self.stylesheet(method=method, skip_error=True)
    if ((not stylesheet) and (self.representation != 'xml')):
        return False
    else:
        return True
