[DR 302] Demonstrating decentralized extensibility support

DR 302 states:
"The WG must demonstrate through use cases that the solution supports
decentralized extensibility in a modular and layered manner."
 
This sentence has very specific qualifying phrases ('through use cases' and 
'in a modular and layered manner').
 
Is the intent of the requirement meant to be specific, as in:
The demonstration "that the solution supports decentralized extensibility
... etc."
must be through use cases,
as opposed to:
The WG should demonstrate "that the solution supports decentralized
extensibility ... etc."
?
 
Since R900 states:
"... it must be possible to determine whether or not the XML Protocol design
enables each scenario."
I suggest dropping the sentence "The WG ..." from DR 302 and adding a new
DR 901:
"The XML Protocol Requirements must include a usage scenario that
requires support of decentralized extensibility ... etc."
 
Similarly, I am unsure whether the requirement is intentionally specific
with
respect to support for
decentralized extensibility in a modular and layered manner
 
Regards, 
Yin Leng