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afaict, media types are supposed to be registered when something has specifically "define[d] a complete set of processing rules"

suffixes or "augmented subtypes" are supposed to indicate that your media type can also be "generically processed" as that +type. for example image/svg+xml indicates that it is an svg image, but that the encoding of svg is xml.

there don't seem to be any specific processing rules for AS2??? which implies it shouldn't be its own media type. but it is. oh well!