SpecGL comments: D Managing Variability

This concludes my reading/review of SpecGL

D Managing Variability
1.  Intro text is awkward.  Suggest:
Specifications allow for variation between conforming implementations for 
different reasons, e.g., adaptation to hardware capacities and 
extensibility.  Variability, while it can provide for broader usage of the 
technology, may impede interoperability.  Watch out for excessive 
variability – that which goes beyond what is needed.  Look for a balance 
between what is needed to allow for flexibility while still achieving the 
desired interoperability.

This section gives advice on finding the right balance.  The reader will 
also benefit from reading, Variability in Specifications [VIS] which goes 
into more details on the analysis of this variability.

2.  P If the technology is subdivided, then indicate which subdivisions are 
mandatory for conformance
-Why care
Delete the Chinese menu syndrome.
In the last sentence,
s/and be conformant/and still be conforming/

3. GP If the technology is profiled, define rules for creating new profiles
-Techniques #3
s/done/down/

D2 Optionality and Options
Suggest changing the Story to an Example.  We don’t have any other Stories 
in this document.