code list validation

Thanks for this, Ray!

At 2006-09-07 16:30 -0400, Ray Denenberg, Library of Congress wrote:
>One of our interests at the Library of Congress  is to be able to point to
>an external codelist, rather than include it within an XML schema. (I'm not
>talking about validating, which I accept is out-of-scope.)

So, perhaps, this would be for guiding data entry
using a tool that only supported W3C Schema?
>In other words, instead of saying:
>
>
>
>You could say:
>