On Jan 3, 2005, at 5:26 PM, Ray Denenberg, Library of Congress wrote:

> What I meant was, we'd need to come up with a table of which
> authority/related combinations are valid and enforce based on that.
> Seems
> like that would be a nightmare (though I haven't really thought it
> through)
> and we'd probably get the table wrong anyway.

Let's see;  a quick idea:

<mads xmlns="">
       <variant type="alternate">
     <related type="whatever">
        <geographic>United States</geographic>

Validate authority/variant (easy with the above structure), and leave
related uncontrolled?