Consider extending scope of this specification by covering two additional endpoints [Federation Historical Keys Response](https://openid.net/specs/openid-federation-1_0-ID4.html#name-federation-historical-keys-res) and [Trust Marked Entities Listing Response](https://openid.net/specs/openid-federation-1_0-ID4.html#name-trust-marked-entities-listing-). Feedback appreciated.