Besides the semantics of @rend, wouldn't it be reasonable to encourage
users to use values in the style of css(2.0)? By proposing that we
perhaps would achieve a bit of interoperability between stylesheets or
at least simplify these?
The example in the guidelines would change like this:
old: <head rend="align(center) slant(upright) case(allcaps)">
new: <head rend="text-align(center) font-style(normal)