> I think a text output will be created on the standard output, or a
> file (if a redirection to file is made). 

No, that would be wrong, either the system handles mailto: URI scheme
(eg by sending mail, for example but any kind of handling is probably
allowed, including i suppsoe sticking the result on standard out, so
perhaps your assertion isn't completely wrong.) then it should handle it
otherwise it should report an error that it doesn't handle it.

> I think, this is again processor specific behaviour.
yes but same is true of any URI scheme, there is no requirement on a
system to support file: or http: schemes for example (either for input
or output)

David

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