how to add a non-single valued attribute, like memberOf

[Klingenstein, Nate]

> I don't think "memberOf" is a well-standardized one, if that's what you're talking about.

We ship it around as eduPersonEntitlement:

<AttributeEncoder name="urn:oid:1.3.6.1.4.1.5923.1.1.1.7" friendlyName="eduPersonEntitlement" encodeType="false" xsi:type="SAML2String" />

Nothing else has ever appeared in the distribution AFAIK.