[SpecGL] D1 Subdividing the spec. (new, last one)

Comment.  Examples and Techniques needed.

Thanks
Lynne

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Good Practice: Define rules for creating profiles

What does this mean?
If profiles are used and profiles can be developed outside the 
specification itself, then provide the rules for creating these derived 
profiles.  These profile rules provide instructions for building profiles 
(e.g., requirements on structure, functionality, encoding, etc.). Derived 
profiles should not contradict predefined profiles, if there are any in the 
base specification.

Why care:
Well-defined rules will facilitate the creation of derived profiles that 
are well-specified, implementable, and testable.  If these rules are 
followed, then the derived profile will conform to the specification.

Techniques.

Examples:
WebCGM