XPath 绝对路径

位置路径指定XML文档中节点的位置。此路径可以是绝对路径,也可以是相对路径。如果位置路径以根节点或”/“开头,则它是绝对路径。以下是一些使用绝对路径定位元素的示例。

/class/student - 在班级根节点内选择学生节点。

<xsl:for-each select = "/class/student">

/class/student/firstname - 选择班级根节点内学生节点的名字。

< p><xsl:value-of select = "/class/student/firstname"/></p>

在此示例中,我们创建了一个样本XML文档 students.xml 及其样式表文档 students.xsl,该文档使用XPath表达式。

students.xml

    <?xml version = "1.0"?>
    <?xml-stylesheet type = "text/xsl" href = "students.xsl"?>
    <class>
       <student rollno = "393">
          <firstname>Dinkar</firstname>
          <lastname>Kad</lastname>
          <nickname>Dinkar</nickname>
          <marks>85</marks>
       </student>
       <student rollno = "493">
          <firstname>Vaneet</firstname>
          <lastname>Gupta</lastname>
          <nickname>Vinni</nickname>
          <marks>95</marks>
       </student>
       <student rollno = "593">
          <firstname>Jasvir</firstname>
          <lastname>Singh</lastname>
          <nickname>Jazz</nickname>
          <marks>90</marks>
       </student>
    </class>

students.xsl

    <?xml version = "1.0" encoding = "UTF-8"?>
    <xsl:stylesheet version = "1.0"
       xmlns:xsl = "http://www.w3.org/1999/XSL/Transform">  

       <xsl:template match = "/" >
          <html>
             <body>
                <h3>Details of each Students. </h3>
                <table border = "1">
                   <tr bgcolor = "#9acd32">
                      <th>Roll No</th>
                      <th>First Name</th>
                      <th>Last Name</th>
                      <th>Nick Name</th>
                      <th>Marks</th>         
                   </tr>    

                   <tr>
                      <td><xsl:value-of select = "/class/student[1]/@rollno"/></td>
                      <td><xsl:value-of select = "/class/student[1]/firstname"/></td>
                      <td><xsl:value-of select = "/class/student[1]/lastname"/></td>
                      <td><xsl:value-of select = "/class/student[1]/nickname"/></td>
                      <td><xsl:value-of select = "/class/student[1]/marks"/></td>         
                   </tr>

                   <tr>
                      <td>
                         <xsl:value-of select = "/class/student/@rollno"/>
                      </td>
                      <td><xsl:value-of select = "/class/student[2]/firstname"/></td>
                      <td><xsl:value-of select = "/class/student[2]/lastname"/></td>
                      <td><xsl:value-of select = "/class/student[2]/nickname"/></td>
                      <td><xsl:value-of select = "/class/student[2]/marks"/></td>         
                   </tr>

                   <tr>
                      <td>
                         <xsl:value-of select = "/class/student[3]/@rollno"/>
                      </td>
                      <td><xsl:value-of select = "/class/student[3]/firstname"/></td>
                      <td><xsl:value-of select = "/class/student[3]/lastname"/></td>
                      <td><xsl:value-of select = "/class/student[3]/nickname"/></td>
                      <td><xsl:value-of select = "/class/student[3]/marks"/></td>         
                   </tr>

                </table> 

             </body>
          </html>
       </xsl:template>
    </xsl:stylesheet>

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