?info required, but spec continues to reserve '?' and '??' as optional synonyms
?info requests anvl/erc, but the spec permits (as always) alternate formats
continues to use THUMP conventions with parenthesized args
?info equivalent to ?info()
This is a small adjustment to the spec that doesn't quite specify how to request alternate formats, but cracks open the door to work that we can complete, not in the spec, but in the AITO context. An example of that might be the THUMP request: ?info()as(application/json)
