Excalibur contains a lot of components that have no significant amount of documentation besides their javadocs. In order to reduce maintainance overhead and be able to focus on the things we deem most important, we have decided to stop actively maintaining those documentation sets.
You have reached this page because you have tried to acces such a set of obsolete documentation. The javadocs for all excalibur packages can be found at http://avalon.apache.org/excalibur/api/.
I think everyone agrees that the absence of documentation for the component you're interested in is a bit of a shame. We are looking for volunteers to write this documentation. If you're interested in helping out, please drop by on the Avalon Development mailing list (Subscription information) for more information on how to do just that.