--On Friday, February 11, 2011 11:43:43 AM -0500 "Matt W. Benjamin"
<[email protected]> wrote:
XCB is structured as a "bulk" interface. Clients receive a sequence
(actually sequences) of messages, where the messages are in the union
(ditto for results). I understood the interesting case to be if a client
receives a sequence of callbacks of intermixed known and known type. I
would expect clients to ignore unknown messages, but I guess the point at
issue is whether a sequence containing unexpected union records can even
be decoded. Can it?
It cannot; with the existing union type, you have to recognize the
discriminator in order to understand the following data. Otherwise you do
not even know enough to be able to ignore it and pick up with the next
thing in the stream. The chief on-the-wire difference in the new type
would be to add an explicit length so that it's possible to keep decoding.
-- Jeff
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