Is there a good way to make an <idno> a link? <ref> isn't allowed inside it. It has no @target.
The Example includes
but I don't see how to tag those as URLs.
For non-web addresses, it could be nice to include a link to the cataloging system, something like
John P McCaskey PhD
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Political Theory Project
History & Philosophy of Science
I Tatti Renaissance Library
Stevens Institute of Technology
College of Arts & Letters