学步园

      generate-id()函数用于为某个节点生成唯一id。参数node用于指定为哪个节点生成唯一id。该id值每次运行XSLT转换时都不相同，而且任意两个节点的id值也不相同。当参数node缺省时，将返回上下文节点的唯一id。

      语法:generate-id(node)

      参数:node节点，可选

     返回值：整数

示例：

xml：

1. <?xml version="1.0" encoding="UTF-8"?>
   <students>
       <student id="001">
           <name>Mike</name>    
           <mark course="Chinese">80</mark>
       </student>
       <student id="002">
           <name>Linda</name>    
           <mark course="Maths">85</mark>
       </student>
       <student id="003">
           <name>Joe</name>    
           <mark course="English">79</mark>
       </student>
       <student id="002">
           <name>Linda</name>    
           <mark course="Chinese">68</mark>
       </student>
       <student id="001">
           <name>Mike</name>    
           <mark course="English">65</mark>
       </student>
       <student id="003">
           <name>Joe</name>    
           <mark course="Chinese">85</mark>
       </student>
       <student id="003">
           <name>Joe</name>    
           <mark course="Maths">80</mark>
       </student>
       <student id="002">
           <name>Linda</name>    
           <mark course="English">70</mark>
       </student>
       <student id="001">
           <name>Mike</name>    
           <mark course="Maths">90</mark>
       </student>
   </students>

xslt：

1. <?xml version="1.0" encoding="UTF-8"?>
   <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
        <xsl:output method="xml" version="1.0" encoding="gb2312" indent="yes"/>    
       <xsl:template match="students">
           <xsl:copy>
               <xsl:for-each select="student">
                   <xsl:sort select="@id" data-type="number"/>
                   <xsl:if test="generate-id(.)=generate-id(../student[@id=current()/@id])">
                       <xsl:copy>
                           <xsl:attribute name="id">
                               <xsl:value-of select="@id"/>
                           </xsl:attribute> 
                           <xsl:attribute name="name">
                               <xsl:value-of select="name"/>
                           </xsl:attribute>  
                           <xsl:for-each select="../student[@id=current()/@id]">
                               <xsl:sort select="mark/@course"/>
                               <xsl:copy-of select="mark"/>                        
                           </xsl:for-each>                  
                       </xsl:copy>                
                   </xsl:if>            
               </xsl:for-each>        
           </xsl:copy>
       </xsl:template>
   </xsl:stylesheet>

结果：

1. <?xml version="1.0" encoding="gb2312"?>
   <students>
       <student id="001" name="Mike">
           <mark course="Chinese">80</mark>
           <mark course="English">65</mark>
           <mark course="Maths">90</mark>
       </student>
       <student id="002" name="Linda">
           <mark course="Chinese">68</mark>
           <mark course="English">70</mark>
           <mark course="Maths">85</mark>
       </student>
       <student id="003" name="Joe">
           <mark course="Chinese">85</mark>
           <mark course="English">79</mark>
           <mark course="Maths">80</mark>
       </student>
   </students>