def _convert_xml_to_share_stats(response):
    '''
    <?xml version="1.0" encoding="utf-8"?>
    <ShareStats>
       <ShareUsage>15</ShareUsage>
    </ShareStats>
    '''
    if response is None or response.body is None:
        return None

    share_stats_element = ETree.fromstring(response.body)
    return int(share_stats_element.findtext('ShareUsage'))
<?xml version="1.0" encoding="utf-8"?>
    <ShareStats>
       <ShareUsage>15</ShareUsage>
    </ShareStats>