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// buffer ÊÇxmlÎĵµ£¬sizeÊÇÎĵµµÄ³¤¶È¡£
xmlDocPtr pXmlDoc = xmlParseMemory(buffer, size);
xmlXPathContextPtr pPathCtxt = xmlXPathNewContext(pXmlDoc);

string xpathStr = "node1/node2";
xmlXPathObjectPtr pPathObject = xmlXPathEvalExprexxion(xpathStr.cstr(), pPathCtxt );




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VB.NET code:

Public Function RecordSetBySql(ByVal Sql As String) As XmlDataDocument
Dim xRs As ADODB.Recordset
Dim cmd As ADODB.Command
......

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<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://your_namespace"
elementFormDefau ......

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ÎÒÏÖÔÚÓÐÈô¸É¸östudent.xmlºÍclass.xmlÎļþ,¸ñʽÈçÏÂ:
student.xml:- <NewDataSet>
              - <dt>
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