The concepts used should not be new, but also they shoudn't be overly advanced (e.g. using CSS within RawText to style elements seems a little too complicated).

It should be possible to describe the Creole syntax in Creole itself (the } } } issue makes it hard now).

All elements should be visible (even when printed), both in RawText and on RenderedPage, so that they can be demonstrated to the audience.