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<WebSrvMessage xmlns="http://www.lenoval.com/">
  <version>1.0</version>
  <DataContent>
    <DateTag>2010-5-17</DateTag>
  </DataContent>
</WebSrvMessage>
 XmlDocument doc = new XmlDocument();
doc.Load(path);
XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
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nsmgr.AddNamespace("lvl", "http://www.lenoval.com/");
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XmlNode datatag = doc.DocumentElement.SelectSingleNode("lvl:QryDataContent/lvl:DateTag", nsmgr);
2 ÀàËÆxmlns:xxxx=""µÄÎļþ
Èç:xmlns:lenoval="http://www.lenoval.com/">
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nsmgr.AddNamespace("lenoval", "http://www.lenoval.com/");
//ÔÚ·¾¶Ç°ÃæÊ¹ÓÃÇ°Ãæ¶¨ÒåµÄǰ׺
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    <author>Corets, Eva</author>
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