code: def tags(self):
       
       if self._tags: return self._tags
       tags = {}
       if not tags: return {}
       for m in [[y.group(1),y.group(2),y.group(3)] for y in [re.match('([^:]{2,2}):([^:]):(.+)$',x) for x in self.entries.optional_fields.split("\t")]]:
          if m[1] == 'i': m[2] = int(m[2])
          elif m[1] == 'f': m[2] = float(m[2])
          tags[m[0]] = TAGDatum(m[1],m[2])
       self._tags = tags
       return self._tags
docs: Access the auxillary data here