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This module has a very simple task - to be a base class for PerlSAX
drivers and filters. It's default behaviour is to pass the input directly
to the output unchanged. It can be useful to use this module as a base class
so you don't have to, for example, implement the characters() callback.
The main advantages that it provides are easy dispatching of events the right
way (ie it takes care for you of checking that the handler has implemented
that method, or has defined an AUTOLOAD), and the guarantee that filters
will pass along events that they aren't implementing to handlers downstream
that might nevertheless be interested in them.
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