Spec Change: Adding @processing-role to list of attributes that donot propagate from keydef to keyref

[Eliot Kimber <ekimber@reallysi.com>]

In the course of evaluating Tarun's various comments and questions about
keyref processing and attribute propagation he pointed out that
@processing-role should not propagate (because it is a property of a
specific topicref and would be inappropriate to apply to a non-resource-only
topicref that did not explicitly specify a value for @processing-role.

I agreed with his assessment but I don't think we ever captured a formal
comment to this effect.

Since I was modifying that part of the spec per comment CO24 I went ahead
and added ", @processing-role" to the @id and @keys already listed.

But we should discuss this change and approve/reject it today if possible.

Cheers,

Eliot

-- 
Eliot Kimber
Senior Solutions Architect
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