def _get_tree(self, **kwargs):
    xml = sample_data('single_work_with_isbn.xml', 'oclc_classify')
    return etree.fromstring(xml, parser=etree.XMLParser(recover=True))
def _get_tree(self, **kwargs):
    xml = sample_data('single_work_with_isbn.xml', 'oclc_classify')
    return etree.fromstring(xml, parser=etree.XMLParser(recover=True))