...themselves!The web SSO interoperability profile throws a bridge between WS-Federation and Liberty Itentity Federation; the web SSO Metadata exchange protocol gives you a chance to establish which identification protocols and providers are supported by your target service [or requestor], enabling dynamic choices and a wide range of id suites. Sounds very similar to policy intersection.
-Links are broken?
indeed! Try en.wikipedia.org/.../Web_Single_Sign-On_Interoperability_Profile