http://www.itu.int/itu-t/recommendations/rec.aspx?id=10440 <== X.1252
http://www.incommon.org/attributes.html <== InCommon Federation (developed out of Internet2 work)
http://www.incommon.org/docs/assurance/IAAF_V1.1.pdf <== InCommon Identity Assurance Assessment Framework.