Providing attributes from CAS

[Stein, Eric]

I'm running Shibboleth IdP with CAS 3.5.1 as my authentication provider. I'd like to provide a username attribute (and possibly others later) to SPs. What is the right way to tackle this? I assume I need CAS to somehow make the attribute available to Shibboleth, but that runs contrary to the documentation I found (https://wiki.shibboleth.net/confluence/display/SHIB2/IdPAddAttribute).

Thanks,
Eric Stein