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→Request
:Looks like a super-class of all service types with meaning "unknown". In this case we may better make the service field optional so if you can specify an unknown service. -- [[User:JakobVoss|JakobVoss]] 02:12, 29 September 2009 (PDT)
::That might work, as long as it's possible to specify a user-displayable label for the service. Won't be able to be understood/acted upon by software, but the user can still be told this is, say, a generic 'Request'.
== Recall ==
