What is the problem you are solving by having the indirection through the new 
IANA registry? There are a zillion downsides to such an IANA registry, only a 
few of which you cover in the current version of the draft.

Proposal 1: an EXTRA-TEXT field containing the template itself:

   {
     "template": "https://resolver.example.com/filtering-incidents/{inc}";,
     "inc": "abc123"
   }

Proposal 2: an EXTRA-TEXT field containing a place controlled by the resolver 
operator to store templates:

   {
     "template_location": 
"https://resolver.example.com/.well-known/pub-res-errors/";,
     "inc": "abc123"
   }

These both have the same security properties as giving a "ro" string, they 
don't require a lookup to IANA, and they don't require IANA to keep a new FCFS 
registry that could be very problematic.

--Paul Hoffman

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