[Bug 31964] Need way to request SMS channel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31964

--- Comment #2 from Simon McVittie <simon.mcvittie at collabora.co.uk> 2010-12-01 04:00:53 PST ---
The property should perhaps be tp:immutable="sometimes" - on some protocols
it'll be immutable. You could add tp:immutable="yes" to Flash while you're
there.

I think having a boolean rather than a tristate enum is reasonable.

One concern I have about this branch is that it changes the semantics of a
channel that implements Chan.I.SMS from "this channel carries SMSs" to "this
channel might conceivably carry SMSs". I think that's probably OK, but it
should be specifically stated in the intro docstring: something like this?

    The presence of this interface on a channel does not imply that
    messages will be delivered via SMS.

    This interface SHOULD NOT appear in the _Interfaces_ property of
    channels where SMSChannel would be immutable and false. It SHOULD
    appear on channels where SMSChannel is immutable and true, and
    also on channels where SMSChannel is mutable (i.e. channels that
    might fall back to sending SMS at any time, such as on MSN).

(or the first SHOULD NOT could be a MAY, if you'd prefer those semantics)

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