XML XPath syntax Summary

I just encountered a multi-query xmldoc. selectsinglenode ("root/element [@ name = 'Big meteorology '] [@ age = '30']")
Query xmldoc. selectsinglenode Based on innertext ("root/element [text () = 'Big meteorology ']")
By the way, collect and summarize.
XPath usage in the selectsinglenode method in XML

1. The most common XML data types are: element, attribute, comment, text.
3. Element, which indicates the <Name> Tom <Name> node. It can include: element, text, comment, processinginstruction, CDATA, and entityreference.
5. Attribute, which is the bold part in <employee>.
7. Comment, pointing to: <! -- My comment --> node.
9. Text, which is in bold of <Name> Tom <Name>.
11. In XML, you can use xmlnode objects to refer to various XML data types.
13. 2.1 query nodes (sets) with known absolute paths)
15. Objnodelist = objdoc. selectnodes ("Company/department/employees/employee ")
17. Or
19. Objnodeobjnodelist = objnode. selectnodes ("/Company/department/employees/employee ")
21. The preceding two methods return a nodelist object. to return a single node, use the selectsinglenode method. If one or more nodes are queried by this method, the first node is returned; if no node is queried, nothing is returned. For example:
23. Objnodeobjnode = objnode. selectsinglenode ("/Company/department/employees/employee ")
25. If not (objnode is nothing) then
27. '-Do Process
29. End if
31. 2.2 query nodes (sets) with known relative paths)
33. You can use a relative path similar to the file path to query XML data.
35. Objnode = objdoc. selectsinglenode ("Company/department ")
37. Objnodeobjnodelist = objnode. selectnodes ("../Department)
39. Objnodeobjnode = objnode. selectnode ("employees/employee ")
41. 2.3 query nodes (sets) with known element names)
43. When using an irregular hierarchical document, you can use the // symbol to query its child, sun, or all other elements in the multi-level document because you do not know the element name of the intermediate level. For example:
45. Objnodelist = objdoc. selectnodes ("company // employee ")
47. 2.4 query attribute nodes
49. All the above methods return element nodes (sets) and attribute. You only need to use the corresponding method and add a @ symbol before the attribute name. For example:
51. Objnodelist = objdoc. selectnodes ("Company/department/employees/employee/@ ID ")
53. Objnodelist = objdoc. selectnodes ("company // @ ID ")
55. 2.5 query text nodes
57. Use text () to obtain the text node.
59. Objnode = objdoc. selectsinglenode ("Company/department/deparmt_name/text ()")
61. 2.6 query nodes with specific conditions
63. Use the [] symbol to query nodes with specific conditions. For example:
65. A. Return the employee node with ID 10102.
67. Objnode = objdoc. selectsinglenode ("Company/department/employees/employee [@ ID = '000000']")
69. B. Return the Name node whose name is Zhang Qi.
71. Objnode = objdoc. selectsinglenode ("Company/department/employees/employee/name [text () = 'zhang qi']")
73. C. Return the Department Name node with 22345 employees
75. Objnode = objdoc. selectsinglenode ("Company/Department [employees/employee/@ ID = '000000']/department_name ")
77. 2.7 query nodes in multiple modes
79. Use the | symbol to obtain nodes in multiple modes. For example:
81. Objnodelist = objdoc. selectnodes ("Company/department/department_name | Company/department/manager ")
83. 2.8 Query any subnode
85. You can use the * symbol to return all the subnodes of the current node.
87. Objnodelist = objdoc. selectnodes ("Company/*/Manager)
89. Or
91. Objnodeobjnodelist = objnode. childnodes
95. 3. Edit XML data
97. 3.1 add an attribute node of an element
99. Dim objnodeattr as xmlnode
101. Objnodeattr = objdoc. createattribute ("ID", nothing)
103. Objnodeattr. innerxml = "101"
105. Objnode. Attributes. append (objnodeattr)
107. 3.2 delete attributes of an element
109. Objnode. Attributes. Remove (objnodeattr)
111. 3.3 Add a child element)
113. Dim objnodechild as xmlnode
115. Objnodechild = objdoc. createelement (nothing, "ID", nothing)
117. Objnodechild. innerxml = "101"
119. Objnode. appendchild (objnodechild)
121. 3.4 delete a child element
123. Objnode. removechild (objnodechild)
125. 3.5 replace a child element
127. Objnode. replaceChild (newchild, oldchild)
131. 4. Reference Data
133. <? XML version = "1.0" encoding = "UTF-8"?>
135. <Company>
137. <Department>
139. <Department_name> Cai wubu </department_name>
141. <Manager> Zhang Bin </Manager>
143. <Employees>
145. <Employee>
147. <Employee_id> 12345 </employee_id>
149. <Name> Zhang Bin </Name>
151. <Gender> male </gender>
153. </Employee>
155. <Employee>
157. <Employee_id> 10101 </employee_id>
159. <Name> Zhang Qi </Name>
161. <Gender> female </gender>
163. </Employee>
165. <Employee>
167. <Employee_id> 10102 </employee_id>
169. <Name> zhang xia </Name>
171. <Gender> male </gender>
173. </Employee>
175. <Employee>
177. <Employee_id> 10201 </employee_id>
179. <Name> zhangchuang </Name>
181. <Gender> male </gender>
183. </Employee>
185. <Employee>
187. <Employee_id> 10202 </employee_id>
189. <Name> Zhang Jun </Name>
191. <Gender> male </gender>
193. </Employee>
195. </Employees>
197. </Department>
199. <Department>
201. <Department_name> kaifa Bu </department_name>
203. <Manager> Wang Bin </Manager>
205. <Employees>
207. <Employee>
209. <Employee_id> 22345 </employee_id>
211. <Name> Wang Bin </Name>
213. <Gender> male </gender>
215. </Employee>
217. <Employee>
219. <Employee_id> 20101 </employee_id>
221. <Name> Wang Qi </Name>
223. <Gender> female </gender>
225. </Employee>
227. <Employee>
229. <Employee_id> 20102 </employee_id>
231. <Name> Wang Xia </Name>
233. <Gender> male </gender>
235. </Employee>
237. <Employee>
239. <Employee_id> 20201 </employee_id>
241. <Name> Wang Chuang </Name>
243. <Gender> male </gender>
245. </Employee>
247. <Employee>
249. <Employee_id> 20201 </employee_id>
251. <Name> Wang Jun </Name>
253. <Gender> male </gender>
255. </Employee>
257. </Employees>
259. </Department>
261. </Company>

URL: http://www.cnblogs.com/greatverve/archive/2011/09/30/xpath.html