Handling a multi-value attribute question

[Mike Flynn]

I am an SP and I have about 140 educational institutions that connect to me via SAML.  We allow the passing of attributes to us to personalize the user's experience on our site.  A typical set is MAIL, SN, GIVENNAME, EPPN.  I have one school that passes GIVENNAME with multiple values.  In a typical scenario where I get a single value, it allows us to greet the user by name on the site as well as personalize other elements.  In this instance, with multiple values, how do I know which value to use?  Should the school in question make that determination and apprise me?  Or is there a generally accepted approach for this?

Thanks!
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