docs: def geo2d(self, name, min=None, max=None):
          """ Create a 2d index.  See:
              http://www.mongodb.org/display/DOCS/Geospatial+Indexing
  
              :param name: Name of the indexed column
              :param min: minimum value for the index
              :param max: minimum value for the index
          """
          self.components.append((name, GEO2D))
          self.__min = min
          self.__max = max
          return self