SpecGL editorial comment

"Good Practice 05: Require an Implementation Conformance Statement as part 
of valid conformance claims."

Editorial suggestion:   s/valid//

Wording like "...valid conformance claim..." is redundant, because it is 
part of a conformance requirement for "conformance claims".  (So of course 
we're talking about 'valid' or 'conforming' instances.)

-Lofton.