def __init__(self, discourse_id=None):
     """
     This class is used to parse the Prolog DRS output from Boxer into a
     hierarchy of python objects.
     """
     DrtParser.__init__(self)
     self.discourse_id = discourse_id
     self.sentence_id_offset = None
     self.quote_chars = [("'", "'", "\\", False)]

 def parse(self, data, signature=None):
     return DrtParser.parse(self, data, signature)

 def parse(self, data, signature=None):
     self._label_counter = Counter(-1)
     return DrtParser.parse(self, data, signature)