Currently it's something like this:
Since jasperreports 3.1.0's jrxml files have switched to XSD, it's only natural that the jrtx files do that also.
PS: It looks like the search functionality on the tracker doesn't work, just try typing in "jrtx": it always displays all issues. Have you considered using JIRA for your issues, like hibernate, spring and maven do? I find it a lot more transparent... Just my 2 cents :)