I guess my main point is that I'd prefer to optimize a bit for authorship (even tools can be helped by being made easier) and, a bit, for HTML5.
So two things that might make life easier as an author:Some canonical property sets (e.g., Dublin Core). I don't want to declare namespaces here
A combined property/value attribute. E.g., propertyV="creator Bijan Parsia" Cheers, Bijan.