Hi nima, using message keys is an interesting idea. I think it would probably be even simpler to just use plain xowiki pages. They have somekind of shortname sou you can easily link to them. Just mount an xowiki instance for every package and have helps texts there. In the pages itself you could have some kind of help resolver (similar to [_ xxx]) that just inserts the relevant xowiki page (or a link to it that opens in a popup).
