Stage 3 proposal for #647, "Replace classification domain with a new attribute"

Stage three proposal attached.
It was reviewed by Robert Anderson, Carsten Brennecke, Gershon Joseph, and Eliot Kimber.
Best, Kris Kristen James Eberlein Chair, OASIS DITA Technical Committee Owner, Eberlein Consulting LLC 
Skype: kriseberlein; voice: +1 (919) 622-1501 Attachment: stage-3-647-replace-classification-domain-with-new-attribute.pdf Description: stage-3-647-replace-classification-domain-with-new-attribute.pdf