currently the add-on combines:
- metadata provider
- virtual metadata
- conditional metadata exclusion
- metadata priority
the combined usage at your properties (of all included add-ons) looks like:


the separation is of course optional - since it's a feature of one of the add-ons, it's used in this example.
you can find the add-on at:
http://code.google.com/p/os890/source/browse/#svn/trunk/java/web/jsf/extval/advanced_metadata