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  Element, Ö¸ÐÎÈç<Name>Tom<Name>µÄ½Úµã¡£Ëü¿ÉÒÔ°üÀ¨£ºElement, Text, Comment, ProcessingInstruction, CDATA, and EntityReference.
  Attribute, Ö¸ÔÚ<Employee id=”12345”>ÖеĴÖÌ岿·Ö¡£
  Comment£¬Ö¸ÐÎÈ磺<!-- my comment --> µÄ½Úµã¡£
  Text£¬Ö¸ÔÚ<Name>Tom<Name>µÄ´ÖÌ岿·Ö¡£
  ÔÚXMLÖУ¬¿ÉÒÔÓÃXmlNode¶ÔÏóÀ´²ÎÕÕ¸÷ÖÖXMLÊý¾ÝÀàÐÍ¡£
  2.1 ²éѯÒÑÖª¾ø¶Ô·¾¶µÄ½Úµã£¨¼¯£©
  objNodeList = objDoc.SelectNodes(“Company/Department/Employees/Employee”)
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  objNodeList = objNode.SelectNodes(“/Company/Department/Employees/Employee”)
  ÒÔÉÏÁ½ÖÖ·½·¨¿É·µ»ØÒ»¸öNodeList¶ÔÏó£¬Èç¹ûÒª·µ»Øµ¥¸ö½Úµã¿ÉʹÓÃSelectSingleNode·½·¨£¬¸Ã·½·¨Èç¹û²éѯµ½Ò»¸ö»ò¶à¸ö½Úµã£¬·µ»ØµÚÒ»¸ö½Úµã£»Èç¹ûûÓвéѯµÄÈκνڵ㷵»Ø Nothing¡£ÀýÈ磺
  objNode = objNode.SelectSingleNode(“/Company/Department/Employees/Employee”)
  If Not (objNode is Nothing) then
   ‘- Do process
  End If
  2.2 ²éѯÒÑÖªÏà¶Ô·¾¶µÄ½Úµã£¨¼¯£©
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  objNode = objDoc.SelectSingleNode(“Company/Department”)
  objNodeList = objNode.SelectNodes(“../Department)
  objNode = objNode.SelectNode(“Employees/Employee”)
  2.3 ²éѯÒÑÖªÔªËØÃûµÄ½Úµã£¨¼¯£©
  ÔÚʹÓò»¹æÔòµÄ²ã´ÎÎĵµÊ±£¬ÓÉÓÚ²»ÖªµÀÖмä²ã´ÎµÄÔªËØÃû£¬¿ÉʹÓÃ//·ûºÅÀ´Ô½¹ýÖмäµÄ½Úµã£¬²éѯÆä×Ó£¬Ëï»ò¶à²ã´ÎÏÂµÄÆäËûËùÓÐÔªËØ¡£ÀýÈ磺
  objNodeList = objDoc.SelectNodes(“Company//Employee”)
  2.4 ²éѯÊôÐÔ£¨attribute£©½Úµã
  ÒÔÉϵĸ÷ÖÖ·½·¨¶¼·µ»ØÔªËØ£¨element)½Úµã£¨¼¯£©£¬·µ»ØÊôÐÔ£¨attribute£©£¬Ö»ÐèÒª²ÉÓÃÏàÓ¦µÄ·½·¨£¬ÔÚÊôÐÔÃûǰ¼ÓÒ»¸ö@·ûºÅ¼´¿É£¬ÀýÈ磺
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