well, your xsl tag isn't valid XML, technically. Each attribute must be a name/value pair. You only have a name.
would be the 'correct' way to do this.
Fair warning, though -- I've had problems with disable-output-escaping before. I've written stylesheets that worked great with saxon but didn't work with other xslt processors, namely the sablotron processor that ships with PHP.
Good luck, let us know if it doesn't work!