Cool guys, Thanks for the answers they made everything clear for me ^_^. By the way I'm really considering on getting close to XCB developing after GSoC ends, I"m really impressed with X. After learning a little more about X I feel that it's architecture design was really well-done and probably years ahead of it's time. Regards =], Marcos <div class="gmail_quote">2010/5/27 Barton C Massey <<a href="mailto:bart@cs.pdx.edu">bart@cs.pdx.edu</a>> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div class="im">In message <<a href="mailto:87mxvnyria.fsf@keller.adm.naquadah.org">87mxvnyria.fsf@keller.adm.naquadah.org</a>> you wrote: > On Wed, May 26 2010, Marcos Roriz wrote: > > One of the thing that I didn't understand is why does > > XCB/Xlib needs to generate Xml for the protocol isn't > > the protocol fixed (at least at core), i.e., "imutable", > > ins't better/easier to just create a implementation or > > does it really needs the power of dynamic generation the > > C bindings? > > The protocol, and its extension, are fixed. The XML files are > hand-written to describe this protocol. Then this XML files are used to > generate various bindings for various languages. > > This mean you do not have to write a full implementation for each > language, just a binding generator. </div>Originally, we took this approach to get rid of a lot of repetitive, error-prone hand-generated boilerplate C code. The ability to automatically produce X11 bindings for other languages, and to easily add understanding of X11 to tools such as Wireshark, has been a nice bonus. The XML also serves as reasonably nice documentation of the protocol; at some point we may consider canonicalizing it as the definition of some X11 extension protocols. If nothing else, it has been good to test the X server against a client library that was developed independently of Xlib: we've found a few server bugs that were masked by corresponding Xlib bugs that way. Bart </blockquote></div> -- Marcos Roriz Bacharelando em Ciência da Computação Universidade Federal de Goiás E-mail: <a href="mailto:marcosrorizinf@gmail.com">marcosrorizinf@gmail.com</a> Home Page:<a href="http://marcosroriz.wordpress.com">http://marcosroriz.wordpress.com</a>