text: from boundingbox import BoundingBox
  from tilespec import Tilespec
  from loader import can_load, load, set_loader_name, DATASPEC_GROUP
  import utils
  
  
  class LoaderCannotReadException(Exception):
      '''Indicates that a given loader cannot read tilespecs from a path
  
      loaders are tried in turn and each one should throw this exception if
      it is unable to read tilespecs from the given path
      '''
      pass
  all = [DATASPEC_GROUP, can_load, load, set_loader_name, utils, BoundingBox,
         LoaderCannotReadException, Tilespec]
  