creaping featurism

Hi,
 Just realized something that might be useful in the rpm metadata.

Would that be useful

Signature list: with a list of the types of signatures in the rpm.

Especially so you can just have a simple entry for 'gpg signed, or not'
or whatever.

So for example:
<signatures>
  <sig type="md5">value</sig>
  <sig type="sha" key>value</sig>
  <sig type="gpg">key id</sig>
</signatures>

would that be useful?
maybe it doesn't make sense to represent it that way.
open to comments or suggestions that say "this is dumb, move along" :)

sorry if I've been a little quiet lately I've been sick and preoccupied
with some other things.

Thanks
-sv