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What is true about these elements in XQuery?

<cars>
    <car><make>Cadillac</make><model>Escalade</model><year>2007</year></car>
    <car><make>Cadillac</make><model>Escalade</model><year>2011</year></car>
    <car><make>Ford</make><model>Mustang</model><year>1968</year></car>
    <car><make>Ford</make><model>Mustang</model><year>1998</year></car>
    <car><make>Mercedes</make><model>C-Class</model><year>1999</year></car>
    <car><make>Mercedes</make><model>C-Class</model><year>2009</year></car>
</cars>