How to use cas-attributes

I have a working mod_auth_cas setup on my server but I would like to use the "require cas-attribute" to validate users with something else than their user name but I don't know how to do it. I tried a couple of things like that:

<Directory "/some/directory">
AuthType CAS
require cas-attribute tamuEduPersonNetID myownnetid
</Directory>

But no success. The university provides this technical information:

Successful validation
CAS returns an XML document containing:...

How to use cas-attributes

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