REST was initially described in the context of HTTP, but is not limited to that protocol. You could write a RESTful SAML in SOAP in JSON API, if you desired. F

REST was initially described in the context of HTTP, but is not limited to that protocol. You could write a RESTful SAML in SOAP in JSON API, if you desired. Fox Sports has a pretty restful XML API. I can't remember if it's SOAP specifically, though.