code: def subclass_notfound(cls, interface_type_resource_class,
                            resource_name=None):
          
  
          msg = "Parser for not found (%s)." % interface_type_resource_class
  
          if resource_name:
              msg = "Could not parse '%s'. %s" % (resource_name, msg)
  
          return cls(msg)
docs: Exception used when the subclass for a given interface type / resource class pair
          cannot be found.