Gobo Eiffel XML Library
Copyright (c) 2002, Eric Bezault and others
Eiffel Forum License v2 (see forum.txt)
$Date: 2004/02/21 00:16:09 $
$Revision: 1.10 $
-- Callbacks event interface to which events are forwarded;
-- If void, a null callback is created on startup.
-- Set dtd_callbacks to a_callbacks.
-- (From XM_DTD_CALLBACKS_SOURCE)
Callbacks for DTD declaration