||A simple instance filter that passes all instances directly
||A simple class for checking the source generated from Filters
||An abstract class for instance filters: objects that take instances
as input, carry out some transformation on the instance and then
output the instance.
||Applies several filters successively.
||This filter is a superclass for simple batch filters.
||This filter contains common behavior of the SimpleBatchFilter and the
||This filter is a superclass for simple stream filters.