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

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

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Eliot Kimber
Senior Solutions Architect
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