XML file format

Before I start work on writing the parser for the virtual keyboard's XML file, I need to tie down the format of the file. Yesterday I came up with the following as my first idea:

<keyboard modes="normal,caps,symbols1,symbols2">
  <mode name="normal" resolutions="320x200, 640x480">
    <layout resolution="320x200" bitmap="normal_320x200.bmp">
      <map>
        <area shape="rect" coords="84,64,246,146">
          <event type="key" code="97" ascii="A" modifiers="shift" />
        </area>
        <area shape="poly" coords="2,12,25,9,34,8,19,22">
          <event type="mode_switch" name="caps" />
        </area>
        ...
      </map>
    </layout>
    <layout resolution="640x480" bitmap="normal_320x200.bmp">
      ...
    </layout>
  </mode>
  <mode name="caps" resolutions="320x200, 640x480">
    ...
  </mode>
</keyboard>

Here each mode tag refers to a different keyboard display, and each mode has a number of layouts - which provide different resolutions for each mode. Doing it this way - rather than having layout as the parent of mode - was a pretty arbitrary choice, with a slight advantage of being more flexible.

The main flaw I noticed here was that the event tags would have to be repeated for each different layout resolution. If we can assume that all different layout resolutions will contain the same events then we can do this:

<keyboard modes="normal,caps,symbols1,symbols2">
  <mode name="normal" resolutions="320x200, 640x480">
    <event name="A" type="key" code="97" ascii="A" modifiers="shift" />
    <event name="shift" type="mode_switch" name="caps" />
    ...
    <layout resolution="320x200" bitmap="normal_320x200.bmp">
      <map>
        <area shape="rect" coords="84,64,246,146" target="A" />
        <area shape="poly" coords="2,12,25,9,34,8,19,22" target="shift" />
        ...
      </map>
    </layout>
    <layout resolution="640x480" bitmap="normal_320x200.bmp">
      ...
    </layout>
  </mode>
  <mode name="caps" resolutions="320x200, 640x480">
   ...
  </mode>
</keyboard>

Where the target of each area refers to an event tag by its name property. This is nice because it means the map sections now use pure HTML IMGMAP syntax. This means the target property can be specified when using an image map tool, and then the output just pasted into the file without any additions.

Therefore I think this format will be the basis for my first attempt at the parser. However, any comments on it will be much appreciated!