这个XML文件有什么问题?

<?xml version="1.0"?>
<Audio sfxVol="255" musicVol="255" />
<Video resolution="1280x960" screenMode="Windowed" antiAlias="0" />
<Input devType="keyboard">
    <KeyBinding ID="up" keyCode="82" keyMod="0" />
    <KeyBinding ID="down" keyCode="81" keyMod="0" />
    <KeyBinding ID="left" keyCode="80" keyMod="0" />
    <KeyBinding ID="right" keyCode="79" keyMod="0" />
    <KeyBinding ID="enter" keyCode="88" keyMod="0" />
</Input>
<?xml version="1.0"?>
<Audio sfxVol="255" music