resultString = "<querycategory><query>shops</query><categorylist><category><name>Gift Shops</name><score>0.36622</score></category><category><name>Wine</name><score>0.14643</score></category><category><name>Coffee &amp; Tea</name><score>0.09771</score></category></categorylist></querycategory>";
 XmlDocument doc = new XmlDocument();
 doc.LoadXml(resultString);&用&amp;实体表示