Current uses already involve getting RADIUS VSA's in non-RFC formats into Diameter packets. Whether we like to admit it or not, the practice already seems to be following David Mitton's draft: http://www.watersprings.org/pub/id/draft-mitton-diameter-radius-vsas-01.txt
Since the "extended attributes" document will need to deal with VSA formats (and Diameter translation of same), perhaps this can be tackled there?
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