@dan Thanks for the fast reply. I am actively experimenting with FusionAuth. I am impressed with it and was able to integrate with a SAML IdP easily.
The InCommon Federation is a collection of SAML metadata between trusted partners. What I have found is that each IdP added to FusionAuth generates it's own entityId. There is no way for one FusionAuth SP entityId to be registered with InCommon that multiple IdPs can use.