I have reviewed this document on behalf of the the operations directorate.

This document appears ready. 

I would observe that the document describes fairly wide latitude with respect to what a server could do with with this facility, yet it's largely posed as facility for the client to reduce the data returned to it. A client that is authorized asking for less data then it is authorized for poses no real challenges however if s the document described one uses authorization level to determine what to include in the partial response the implementations need to be careful about how the implement such a control to prevent information leakage (what fielsd are omitted could tell you significant things about your authorization level for example. These server implementation  considerations seem outside the scope of this document, and client requests for limited fields in a result don't have this property.