Nothing would make me happier than to be proved wrong on this, though ...
(yeah, I'm an old SGML type. Things that don't validate worry me.)
Update, Aug 5: In an attempt to prevent further XP slide, I have to admit that I hadn't RTFM quite thoroughly enough before posting. In addition to the method given by mbadolato below, there's also the vanguard_compatibility_mode option, which allows you to code simple variables as %NAME%.
bowling trophy thieves, die!