Can you have a positional tolerance feature control frame on a hole without referance to any datums? If this is a correct way of dimensioning, then what is it controling? Perpindicularity, hole to hole, something else?
I had a quick look in 14.5 and a simple answer didn't jump out at me, so maybe I'll leave this one to others unless I get a bolt of inspiration.
I'd normally expect at least a single datum called out to give perpendicularity but like I said, didn't find a concise explanation in a quick flick through section 5.