testing for attribute-only

Hello

Is there a concise test for the context node that will distinguish between a
node that has attributes at most:

  <a><a/>
  <a docref="123456"/>

and a node that has more than attributes?

  <a>some text</a>
  <a case="2"><elementary>my dear Watson</elementary><a/>

I have been inadvertently dropping a few dozen of the latter type in trying
to clean up several thousand of the former in my input documents.

Cheers
Trevor