The Protocol Design document available below describes both a protocol for linking user IdP accounts together at a linking service and a SAML 2.0 and IDWSF Liberty Alliance Discovery Service based aggregation protocol that we believe fits our conceptual model. The linking protocol uses only SAML V2.0 protocol mesages. The other two models use a combination of both the SAML V2.0 and Liberty Alliance IDWSF specifications to perform aggregation. If you wish to comment on these protocol designs please send any comments to our mailing list.
We also provide an earlier version of the protocol mapping document which contains three alternate protocol mappings. The first of these mapping is based soley on SAML 2.0 protocols whereas the two other mappings show two alternate approachs using both the SAML 2.0 and Liberty Alliance IDWSF Identity Mapping Profile. The use of the identity mapping profile was abandoned after consulation with the Liberty Alliance Consortium who suggested that we utilise the more widely used IDWSF Disovery Profile instead.