Attribute grouping. The reason why the various key IDs, etc. are all part of the Keying-Material attribute is because they need to be associated w/a specific key (it's possible to deliver more than one key in a single message). Attribute grouping enables that association w/out requiring the multiple sub-attribute technique that we use.
This would be helpful for several reasons: 1. It would avoid a discussion of the merits/demerits of complex attributes.2. It would disentangle discussion of the keywrap mechanism (which doesn't seem to have encountered objections) from the key naming issue.
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