What is wrong with my XML?

[Tyli]

Simply, the subject.
I'm trying to learn how to make an XML so I can replace music in Pokemon Battle Revolution.  I'm trying to use a Mario Kart Wii XML and edit it a bit, but with absolutely no luck.

Here is what I have in the XML:

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<wiidisc version="1">
<id game="RPBE"/>
<options>
<section name="Options">
<option name="/PBR Hacks">
<choice name="Enabled">
<patch id="pbr"/>
</choice>
</option>
</section>
</options>
<patch id="pbr">
<folder external="/pbr" recursive="false"/>
<folder external="/pbr/sound/Battletopia09.brstm" disc="/sound/Battletopia09.brstm"/>
</patch>
</wiidisc>

Is there something I'm doing wrong?