@lanodan @evan
Yadis uses XRDS
XRDS birthed XRD (simpler), which birthed JRD (equivalent in JSON)
Yadis was used by OpenID 2.0, and birthed (simpler) pre-standard WebFinger, which evolved into (compatible) RFC 6415 host-meta / 'lrdd' WebFinger (uses XRD), which got hammered into RFC 7033 WebFinger by the OpenID Connect people
OStatus uses pre-standard/RFC 6415 WebFinger, ActivityPub uses (defacto) RFC 7033 WebFinger
The more things change, the more they stay the same