Right now the project format is a big <pitivi> tag with everyting inside.

I think it makes a lot of sense to have a <project> tag: for clarity first (<pitivi>stuff</pitivi> is a project? Doesn't look right), and also for flexibility. We might want to export more than a project later (two projects?) ; or just separate the project (timeline elements, splitting, etc) and the actual resources (video/images). 

   <pitivi version="0.14">
   <project name="Untitled1" author"Stéphane" date="13-07-2011">
       <timeline>
          <element resource="res_uid">...
      <audioSettings>
     <videoSettings>
    </project>
    <resources>
         <video uid="1219142" filename="" path="" name="">
         <picture> etc
   </resources>
</pitivi>

Even if we don't separate the resouces, it makes sense to have a <project> element. What do you think?

This is in sight of my metadata branch. I'd rather have a <project> tag with the metadata attributes (as in the stub above) than a <metadata> element.