XPath语法(5)

2015-07-18 05:41:00
admin
原创 419
摘要:XPath的相关知识

preceding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> 

 

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> 

 

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> 

 

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> 

  

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