A specific IValidate instance, which is Ant compatible, that executes an
ant Task/Target (via Reference), and registers an error if the "build"
fails. Use the "refid" attribute to set the reference task/target.
Set the "sysid" to set the ID to register the "system" variable in the
project.
author: Matt Albrecht groboclown@users.sourceforge.net version: $Date: 2003/02/10 22:52:25 $ since: June 13, 2002