This package consists of a number of Source Filters. For more details
see the pod documentation embedded in the .pm files.

If you intend using the Filter::Call functionality, I would strongly
recommend that you check out Damian Conway's excellent Filter::Simple
module. This module provides a much cleaner interface than
Filter::Util::Call. Although it doesn't allow the fine control that
Filter::Util::Call does, it should be adequate for the majority of
applications.