Abstract
For service documents, go back from atom:title to app:title.
Status
in play
Rationale
It looks dorky, adds complexity, decreases readability. Every implementor who wants to do even the most basic APP processing is now going to have to handle 2 instead of 1 namespace. The benefits are highly unclear.
Proposal
In protocol-10, change all instances of atom:title to app:title.
Impacts
Greater simplicity, slightly less work for implementors.