http://www.zvon.org/xxl/XPathTutorial/General_chi/examples.html

简介

XPath由W3C的 XPath 1.0 标准描述.本教程通过实例来展示XPath的一些特性.

你可以从以下内容开始:



1。基本的XPath语法类似于在一个文件系统中定位文件,如果路径以斜线 / 开始, 那么该路径就表示到一个元素的绝对路径

/AAA
选择根元素AAA


     <AAA>

          <BBB/>

          <CCC/>

          <BBB/>

          <BBB/>

          <DDD>

               <BBB/>

          </DDD>

          <CCC/>

     </AAA>
/AAA/CCC
选择AAA的所有CCC子元素


     <AAA>

          <BBB/>

          <CCC/>

          <BBB/>

          <BBB/>

          <DDD>

               <BBB/>

          </DDD>

          <CCC/>

     </AAA>
/AAA/DDD/BBB
选择AAA的子元素DDD的所有子元素


     <AAA>

          <BBB/>

          <CCC/>

          <BBB/>

          <BBB/>

          <DDD>

               <BBB/>

          </DDD>

          <CCC/>

     </AAA>

2。如果路径以双斜线 // 开头, 则表示选择文档中所有满足双斜线//之后规则的元素(无论层级关系)

//BBB
选择所有BBB元素


     <AAA>

          <BBB/>

          <CCC/>

          <BBB/>

          <DDD>

               <BBB/>

          </DDD>

          <CCC>

               <DDD>

                    <BBB/>

                    <BBB/>

               </DDD>

          </CCC>

     </AAA>
//DDD/BBB
选择所有父元素是DDD的BBB元素


     <AAA>

          <BBB/>

          <CCC/>

          <BBB/>

          <DDD>

               <BBB/>

          </DDD>

          <CCC>

               <DDD>

                    <BBB/>

                    <BBB/>

               </DDD>

          </CCC>

     </AAA>

3。星号 * 表示选择所有由星号之前的路径所定位的元素

/AAA/CCC/DDD/*
选择所有路径依附于/AAA/CCC/DDD的元素


     <AAA>

          <XXX>

               <DDD>

                    <BBB/>

                    <BBB/>

                    <EEE/>

                    <FFF/>

               </DDD>

          </XXX>

          <CCC>

               <DDD>

                    <BBB/>

                    <BBB/>

                    <EEE/>

                    <FFF/>

               </DDD>

          </CCC>

          <CCC>

               <BBB>

                    <BBB>

                         <BBB/>

                    </BBB>

               </BBB>

          </CCC>

     </AAA>
/*/*/*/BBB
选择所有的有3个祖先元素的BBB元素


     <AAA>

          <XXX>

               <DDD>

                    <BBB/>

                    <BBB/>

                    <EEE/>

                    <FFF/>

               </DDD>

          </XXX>

          <CCC>

               <DDD>

                    <BBB/>

                    <BBB/>

                    <EEE/>

                    <FFF/>

               </DDD>

          </CCC>

          <CCC>

               <BBB>

                    <BBB>

                         <BBB/>

                    </BBB>

               </BBB>

          </CCC>

     </AAA>
//*
选择所有元素


     <AAA>

          <XXX>

               <DDD>

                    <BBB/>

                    <BBB/>

                    <EEE/>

                    <FFF/>

               </DDD>

          </XXX>

          <CCC>

               <DDD>

                    <BBB/>

                    <BBB/>

                    <EEE/>

                    <FFF/>

               </DDD>

          </CCC>

          <CCC>

               <BBB>

                    <BBB>

                         <BBB/>

                    </BBB>

               </BBB>

          </CCC>

     </AAA>

4。方块号里的表达式可以进一步的指定元素, 其中数字表示元素在选择集里的位置, 而last()函数则表示选择集中的最后一个元素.

/AAA/BBB[1]
选择AAA的第一个BBB子元素


     <AAA>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

     </AAA>
/AAA/BBB[last()]
选择AAA的最后一个BBB子元素


     <AAA>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

     </AAA>

5。

//@id
选择所有的id属性


     <AAA>

          <BBB id = "b1"/>

          <BBB id = "b2"/>

          <BBB name = "bbb"/>

          <BBB/>

     </AAA>
//BBB[@id]
选择有id属性的BBB元素


     <AAA>

          <BBB id = "b1"/>

          <BBB id = "b2"/>

          <BBB name = "bbb"/>

          <BBB/>

     </AAA>
//BBB[@name]
选择有name属性的BBB元素


     <AAA>

          <BBB id = "b1"/>

          <BBB id = "b2"/>

          <BBB name = "bbb"/>

          <BBB/>

     </AAA>
//BBB[@*]
选择有任意属性的BBB元素


     <AAA>

          <BBB id = "b1"/>

          <BBB id = "b2"/>

          <BBB name = "bbb"/>

          <BBB/>

     </AAA>
//BBB[not(@*)]
选择没有属性的BBB元素


     <AAA>

          <BBB id = "b1"/>

          <BBB id = "b2"/>

          <BBB name = "bbb"/>

          <BBB/>

     </AAA>

6。属性的值可以被用来作为选择的准则, normalize-space函数删除了前部和尾部的空格, 并且把连续的空格串替换为一个单一的空格

//BBB[@id='b1']
选择含有属性id且其值为'b1'的BBB元素


     <AAA>

          <BBB id = "b1"/>

          <BBB name = " bbb "/>

          <BBB name = "bbb"/>

     </AAA>
//BBB[@name='bbb']
选择含有属性name且其值为'bbb'的BBB元素


     <AAA>

          <BBB id = "b1"/>

          <BBB name = " bbb "/>

          <BBB name = "bbb"/>

     </AAA>
//BBB[normalize-space(@name)='bbb']
选择含有属性name且其值(在用normalize-space函数去掉前后空格后)为'bbb'的BBB元素


     <AAA>

          <BBB id = "b1"/>

          <BBB name = " bbb "/>

          <BBB name = "bbb"/>

     </AAA>

7。count()函数可以计数所选元素的个数

//*[count(BBB)=2]
选择含有2个BBB子元素的元素


     <AAA>

          <CCC>

               <BBB/>

               <BBB/>

               <BBB/>

          </CCC>

          <DDD>

               <BBB/>

               <BBB/>

          </DDD>

          <EEE>

               <CCC/>

               <DDD/>

          </EEE>

     </AAA>
//*[count(*)=2]
选择含有2个子元素的元素


     <AAA>

          <CCC>

               <BBB/>

               <BBB/>

               <BBB/>

          </CCC>

          <DDD>

               <BBB/>

               <BBB/>

          </DDD>

          <EEE>

               <CCC/>

               <DDD/>

          </EEE>

     </AAA>
//*[count(*)=3]
选择含有3个子元素的元素


     <AAA>

          <CCC>

               <BBB/>

               <BBB/>

               <BBB/>

          </CCC>

          <DDD>

               <BBB/>

               <BBB/>

          </DDD>

          <EEE>

               <CCC/>

               <DDD/>

          </EEE>

     </AAA>

8。name()函数返回元素的名称, start-with()函数在该函数的第一个参数字符串是以第二个参数字符开始的情况返回true, contains()函数当其第一个字符串参数包含有第二个字符串参数时返回true.

//*[name()='BBB']
选择所有名称为BBB的元素(这里等价于//BBB)


     <AAA>

          <BCC>

               <BBB/>

               <BBB/>

               <BBB/>

          </BCC>

          <DDB>

               <BBB/>

               <BBB/>

          </DDB>

          <BEC>

               <CCC/>

               <DBD/>

          </BEC>

     </AAA>
//*[starts-with(name(),'B')]
选择所有名称以"B"起始的元素


     <AAA>

          <BCC>

               <BBB/>

               <BBB/>

               <BBB/>

          </BCC>

          <DDB>

               <BBB/>

               <BBB/>

          </DDB>

          <BEC>

               <CCC/>

               <DBD/>

          </BEC>

     </AAA>
//*[contains(name(),'C')]
选择所有名称包含"C"的元素


     <AAA>

          <BCC>

               <BBB/>

               <BBB/>

               <BBB/>

          </BCC>

          <DDB>

               <BBB/>

               <BBB/>

          </DDB>

          <BEC>

               <CCC/>

               <DBD/>

          </BEC>

     </AAA>

9。string-length函数返回字符串的字符数,你应该用&lt;替代<, 用&gt;代替>

//*[string-length(name()) = 3]
选择名字长度为3的元素


     <AAA>

          <Q/>

          <SSSS/>

          <BB/>

          <CCC/>

          <DDDDDDDD/>

          <EEEE/>

     </AAA>
//*[string-length(name()) < 3]
选择名字长度小于3的元素


     <AAA>

          <Q/>

          <SSSS/>

          <BB/>

          <CCC/>

          <DDDDDDDD/>

          <EEEE/>

     </AAA>
//*[string-length(name()) > 3]
选择名字长度大于3的元素


     <AAA>

          <Q/>

          <SSSS/>

          <BB/>

          <CCC/>

          <DDDDDDDD/>

          <EEEE/>

     </AAA>

10。多个路径可以用分隔符 | 合并在一起

//CCC | //BBB
选择所有的CCC和BBB元素


     <AAA>

          <BBB/>

          <CCC/>

          <DDD>

               <CCC/>

          </DDD>

          <EEE/>

     </AAA>
/AAA/EEE | //BBB
选择所有的BBB元素和所有是AAA的子元素的EEE元素


     <AAA>

          <BBB/>

          <CCC/>

          <DDD>

               <CCC/>

          </DDD>

          <EEE/>

     </AAA>
/AAA/EEE | //DDD/CCC | /AAA | //BBB
可以合并的路径数目没有限制


     <AAA>

          <BBB/>

          <CCC/>

          <DDD>

               <CCC/>

          </DDD>

          <EEE/>

     </AAA>

11。child轴(axis)包含上下文节点的子元素, 作为默认的轴,可以忽略不写.

/AAA
等价于 /child::AAA


     <AAA>

          <BBB/>

          <CCC/>

     </AAA>
/child::AAA
等价于/AAA


     <AAA>

          <BBB/>

          <CCC/>

     </AAA>
/AAA/BBB
等价于/child::AAA/child::BBB


     <AAA>

          <BBB/>

          <CCC/>

     </AAA>
/child::AAA/child::BBB
等价于/AAA/BBB


     <AAA>

          <BBB/>

          <CCC/>

     </AAA>
/child::AAA/BBB
二者都可以被合并


     <AAA>

          <BBB/>

          <CCC/>

     </AAA>

12。descendant (后代)轴包含上下文节点的后代,一个后代是指子节点或者子节点的子节点等等, 因此descendant轴不会包含属性和命名空间节点.

/descendant::*
选择文档根元素的所有后代.即所有的元素被选择


     <AAA>

          <BBB>

               <DDD>

                    <CCC>

                         <DDD/>

                         <EEE/>

                    </CCC>

               </DDD>

          </BBB>

          <CCC>

               <DDD>

                    <EEE>

                         <DDD>

                              <FFF/>

                         </DDD>

                    </EEE>

               </DDD>

          </CCC>

     </AAA>
/AAA/BBB/descendant::*
选择/AAA/BBB的所有后代元素


     <AAA>

          <BBB>

               <DDD>

                    <CCC>

                         <DDD/>

                         <EEE/>

                    </CCC>

               </DDD>

          </BBB>

          <CCC>

               <DDD>

                    <EEE>

                         <DDD>

                              <FFF/>

                         </DDD>

                    </EEE>

               </DDD>

          </CCC>

     </AAA>
//CCC/descendant::*
选择在祖先元素中有CCC的所有元素


     <AAA>

          <BBB>

               <DDD>

                    <CCC>

                         <DDD/>

                         <EEE/>

                    </CCC>

               </DDD>

          </BBB>

          <CCC>

               <DDD>

                    <EEE>

                         <DDD>

                              <FFF/>

                         </DDD>

                    </EEE>

               </DDD>

          </CCC>

     </AAA>
//CCC/descendant::DDD
选择所有以CCC为祖先元素的DDD元素


     <AAA>

          <BBB>

               <DDD>

                    <CCC>

                         <DDD/>

                         <EEE/>

                    </CCC>

               </DDD>

          </BBB>

          <CCC>

               <DDD>

                    <EEE>

                         <DDD>

                              <FFF/>

                         </DDD>

                    </EEE>

               </DDD>

          </CCC>

     </AAA>

13。parent轴(axis)包含上下文节点的父节点, 如果有父节点的话

//DDD/parent::*
选择DDD元素的所有父节点


     <AAA>

          <BBB>

               <DDD>

                    <CCC>

                         <DDD/>

                         <EEE/>

                    </CCC>

               </DDD>

          </BBB>

          <CCC>

               <DDD>

                    <EEE>

                         <DDD>

                              <FFF/>

                         </DDD>

                    </EEE>

               </DDD>

          </CCC>

     </AAA>

14。ancestor轴(axis)包含上下节点的祖先节点, 该祖先节点由其上下文节点的父节点以及父节点的父节点等等诸如此类的节点构成,所以ancestor轴总是包含有根节点,除非上下文节点就是根节点本身.

/AAA/BBB/DDD/CCC/EEE/ancestor::*
选择一个绝对路径上的所有节点


     <AAA>

          <BBB>

               <DDD>

                    <CCC>

                         <DDD/>

                         <EEE/>

                    </CCC>

               </DDD>

          </BBB>

          <CCC>

               <DDD>

                    <EEE>

                         <DDD>

                              <FFF/>

                         </DDD>

                    </EEE>

               </DDD>

          </CCC>

     </AAA>
//FFF/ancestor::*
选择FFF元素的祖先节点


     <AAA>

          <BBB>

               <DDD>

                    <CCC>

                         <DDD/>

                         <EEE/>

                    </CCC>

               </DDD>

          </BBB>

          <CCC>

               <DDD>

                    <EEE>

                         <DDD>

                              <FFF/>

                         </DDD>

                    </EEE>

               </DDD>

          </CCC>

     </AAA>

15。following-sibling轴(axis)包含上下文节点之后的所有兄弟节点

/AAA/BBB/following-sibling::*


     <AAA>

          <BBB>

               <CCC/>

               <DDD/>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//CCC/following-sibling::*


     <AAA>

          <BBB>

               <CCC/>

               <DDD/>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>

16。preceding-sibling 轴(axis)包含上下文节点之前的所有兄弟节点

/AAA/XXX/preceding-sibling::*


     <AAA>

          <BBB>

               <CCC/>

               <DDD/>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//CCC/preceding-sibling::*


     <AAA>

          <BBB>

               <CCC/>

               <DDD/>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>

17。following轴(axis)包含同一文档中按文档顺序位于上下文节点之后的所有节点, 除了祖先节点,属性节点和命名空间节点

/AAA/XXX/following::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ>

                    <DDD/>

                    <DDD>

                         <EEE/>

                    </DDD>

               </ZZZ>

               <FFF>

                    <GGG/>

               </FFF>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//ZZZ/following::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ>

                    <DDD/>

                    <DDD>

                         <EEE/>

                    </DDD>

               </ZZZ>

               <FFF>

                    <GGG/>

               </FFF>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>

18。following轴(axis)包含同一文档中按文档顺序位于上下文节点之前的所有节点, 除了祖先节点,属性节点和命名空间节点

/AAA/XXX/preceding::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ>

                    <DDD/>

               </ZZZ>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//GGG/preceding::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ>

                    <DDD/>

               </ZZZ>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>

19。descendant-or-self 轴(axis)包含上下文节点本身和该节点的后代节点

/AAA/XXX/descendant-or-self::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ>

                    <DDD/>

               </ZZZ>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//CCC/descendant-or-self::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ>

                    <DDD/>

               </ZZZ>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>

20。ancestor-or-self 轴(axis)包含上下文节点本身和该节点的祖先节点

/AAA/XXX/DDD/EEE/ancestor-or-self::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ>

                    <DDD/>

               </ZZZ>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//GGG/ancestor-or-self::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ>

                    <DDD/>

               </ZZZ>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <DDD/>

                    <CCC/>

                    <FFF/>

                    <FFF>

                         <GGG/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>

21。ancestor, descendant, following, preceding 和self轴(axis)分割了XML文档(忽略属性节点和命名空间节点), 不能交迭, 而一起使用则包含所有节点

//GGG/ancestor::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ/>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <FFF>

                         <HHH/>

                         <GGG>

                              <JJJ>

                                   <QQQ/>

                              </JJJ>

                              <JJJ/>

                         </GGG>

                         <HHH/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//GGG/descendant::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ/>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <FFF>

                         <HHH/>

                         <GGG>

                              <JJJ>

                                   <QQQ/>

                              </JJJ>

                              <JJJ/>

                         </GGG>

                         <HHH/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//GGG/following::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ/>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <FFF>

                         <HHH/>

                         <GGG>

                              <JJJ>

                                   <QQQ/>

                              </JJJ>

                              <JJJ/>

                         </GGG>

                         <HHH/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//GGG/preceding::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ/>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <FFF>

                         <HHH/>

                         <GGG>

                              <JJJ>

                                   <QQQ/>

                              </JJJ>

                              <JJJ/>

                         </GGG>

                         <HHH/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//GGG/self::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ/>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <FFF>

                         <HHH/>

                         <GGG>

                              <JJJ>

                                   <QQQ/>

                              </JJJ>

                              <JJJ/>

                         </GGG>

                         <HHH/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>
//GGG/ancestor::* | //GGG/descendant::* | //GGG/following::* | //GGG/preceding::* | //GGG/self::*


     <AAA>

          <BBB>

               <CCC/>

               <ZZZ/>

          </BBB>

          <XXX>

               <DDD>

                    <EEE/>

                    <FFF>

                         <HHH/>

                         <GGG>

                              <JJJ>

                                   <QQQ/>

                              </JJJ>

                              <JJJ/>

                         </GGG>

                         <HHH/>

                    </FFF>

               </DDD>

          </XXX>

          <CCC>

               <DDD/>

          </CCC>

     </AAA>

22。div运算符做浮点除法运算, mod运算符做求余运算, floor函数返回不大于参数的最大整数(趋近于正无穷), ceiling返回不小于参数的最小整数(趋近于负无穷)

//BBB[position() mod 2 = 0 ]
选择偶数位置的BBB元素


     <AAA>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <CCC/>

          <CCC/>

          <CCC/>

     </AAA>
//BBB[ position() = floor(last() div 2 + 0.5) or position() = ceiling(last() div 2 + 0.5) ]
选择中间的BBB元素


     <AAA>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <CCC/>

          <CCC/>

          <CCC/>

     </AAA>
//CCC[ position() = floor(last() div 2 + 0.5) or position() = ceiling(last() div 2 + 0.5) ]
选择中间的CCC元素


     <AAA>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <BBB/>

          <CCC/>

          <CCC/>

          <CCC/>

     </AAA>

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