[PATCH] update protocol specification to match wire protocol

Paul Sbarra sbarra.paul at gmail.com
Fri Sep 5 17:18:44 PDT 2014

On Fri, Sep 5, 2014 at 7:51 AM, Pekka Paalanen <ppaalanen at gmail.com> wrote:

> I took a look at both of them, you are making an incompatible change to
> wayland.xml, and breaking the generator.
> Essentially you are breaking the unwritten specification on how the XML
> files are processed into wire format and language bindings.
> Wayland-scanner is not the only generator, and wayland.xml is not the
> only XML file in existence.
> If you look carefully, you see that there is absolutely no
> documentation on how to generate the wire protocol or C function
> signatures from the XML. It is all undocumented.

Thanks for the continued dialog.  I was also surprised that the reqest /
event opcodes were not specified in the specification but was mentioned in
the bug report for improved documentation.

The one major critique that you pointed out in your previous message is
that this patch is completely non-generic and written under the (apparently
false) assumption that the scanner is only used to provide the code-gen for
the wayland.xml provided in the wayland repo.  The intention was to
possibly elicit help to replace the string comparisons with something more

If indeed the scanner application is used by external projects or to parse
external specifications (as you'd mentioned custom extensions) then indeed
this changeset is not generic enough for that case.  I think that's
probably the main factor to why the unique rule is needed, because I don't
think it's possible to come to a generic solution without also changing the

At least now there's some dialog in the mailing list for others to consider
until the docs get updated.  Again I thank you for taking the time (and
patience) to help me get up to speed.

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