digester-rss was a part of commons-digester in the later versions it was moved to the examples folder, but some application use it, including eclipse it's available in to the java overlay http://overlays.gentoo.org/proj/java/browser/migrated-java-experimental-overlay/dev-java/commons-digester-rss
This ebuild request has been reported in 2006 (!). Do we still want it added to the tree ? If someone does, please comment. Otherwise I will close this bug.
Closing as per previous comment.