<?xml version="1.0" encoding="utf-8"?>

<!--
  Description: Only one occurrence allowed
  Expect:      DuplicateElement{element:identifier,parent:playlist}
-->

<playlist version="1" xmlns="http://xspf.org/ns/0/">

  <identifier>http://example.com</identifier>
  <identifier>http://example.com</identifier>

  <trackList/>

</playlist>