On a side note....
My custom tags auto complete works without me having to hack some xml file buried somewhere in the plugins directory! :D This is fantastic. All I had to do was setup my xml catalog and boom it worked.
When I edit my xsd file (the one associated to my taglib in the xml catalog) my content assist is not updated with the new attributes. Is this something I should raise in another topic? Or is it not really a Jboss Tools problem?