experimental
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... iana-registered-service
app-protocol = experimental-protocol / iana-registered-protocol
experimental-service ...
... experimental-protocol / iana-registered-protocol
experimental-service = "x-" 1*30ALPHANUMSYM
experimental-protocol = "x-" 1*30ALPHANUMSYM
...
... experimental-service = "x-" 1*30ALPHANUMSYM
experimental-protocol = "x-" 1*30ALPHANUMSYM
iana-registered-service = ALPHA ...
... tags that start with "x-" are
considered experimental, and no provision is made to prevent
duplicate use of the same string. Implementors use them at their own
...