Draft reply to question on PNG charter

I have an action to propose a reply to the question in our review of the 
proposed PNG charter:

https://github.com/w3c/strategy/issues/268

We said we need to know more about the deliverables before signing off, 
and Chris said he thought it was covered. Proposed response:

The information in the Background section is a useful introduction to 
the reasons for forming this WG. However, that is not part of the 
charter template and reads in a very "non-normative" way. Therefore we 
do not think it sufficiently defines the proposed chartered work. The 
scope should be more detailed about the meaning of "selected new 
features", at the very least mentioning the ones in the background, and 
also giving any indicators possible to other work currently on the 
horizon. APA may have a great interest in horizontal review and / or 
feature development, or it may have very little, depending on the nature 
of the work. More detail on that would inform subsequent comments about 
the level of coordination APA requests to be mentioned in the charter.

Michael