One of the first tasks the OIDCre group engaged with is to discuss and document a consistent way for mapping identifiers (sub) and attributes (claims) between SAML and OIDC, in the context of how we use these in the R&E community.
Most of the discussion can be found in the OIDCre mailing list archives (

These discussion have lead to the creation of a (DRAFT) recommendation, which is currently (July 2018) under discussion and is supposed to be presented to the REFEDs community for formal consultation by Oct 2018 at REFEDS39