Here's a piece of my file with a collection (under <records> key):
Code:
<xs1:playlist title="His Dark Materials" sourceid="0" id="1">
<xs1:item id="24"/>
<xs1:item id="25"/>
<xs1:item id="26"/>
</xs1:playlist>
"id" is the id of the book, e.g.:
Code:
<xs1:text author="Philip Pullman" page="138" part="0" scale="1" status="2"
sourceid="2" id="24" date="Wed, 11 Oct 2006 18:46:58 GMT" mime="application/x-sony-bbeb" path="books/cbuscerhi000d80a.lrx" size="646305" title="The Golden Compass" titleSorter="Golden Compass">