XPath语法(3)

2015-07-18 05:37:00
admin
原创 398
摘要:XPath的相关知识

 

//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> 

 

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> 

 

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> 

 

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> 

 

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> 

 

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> 

  

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