FEP-2c59: Discovery of a Webfinger address from an ActivityPub actor

Standards Fediverse Enhancement Proposals
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The reasons I like using XRD aliases are

  1. The semantics are reasonably well understood already, because everyone already implements WebFinger
  2. Someone else (the XRD WG) already documented them
  3. This allows you to skip WF in the ActivityPub id to acct: handle direction. If you broaden this concept more widely into a syntax for transferring XRDs/JRDs, then it also directly gives us a method to do what @trwnh proposed with skipping JRD by basically defining a syntax for JRD-in-JSON-LD/AS2