def convert_shelves(element):
    """Get the names of all the shelves that hold this book."""
    # The shelves for a review are returned in the following format:
    #
    #    <shelves>
    #      <shelf name="read" exclusive="true"/>
    #      <shelf name="fiction" exclusive="false" review_shelf_id="1234"/>
    #    </shelves>
    #
    return [shelf.attrib['name'] for shelf in element.findall('shelf')]