XPath - 比较运算符

XPath 定义以下比较运算符供 XPath 表达式使用。

序号	运算符及说明
1	= 等于
2	!= 不等于
3	< 小于
4	> 大于
5	<= 小于或等于
6	>= 大于或等于

示例

此示例创建了一个 <student> 元素表格，其中包含学籍号属性及其子项 <firstname>,<lastname><nickname> 和 <marks>，方法是迭代遍历每个学生。它检查分数是否大于 90，然后打印学生详情。

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>
            <h2>Students</h2>
					
            <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>
						
               <xsl:for-each select = "class/student">
                  <xsl:if test = "marks > 90">
                     <tr>
                        <td><xsl:value-of select = "@rollno"/></td>
                        <td><xsl:value-of select = "firstname"/></td>
                        <td><xsl:value-of select = "lastname"/></td>
                        <td><xsl:value-of select = "nickname"/></td>
                        <td><xsl:value-of select = "marks"/></td>
                     </tr>
                  </xsl:if>
               </xsl:for-each>
            </table>
         </body>
      </html>
   </xsl:template>
</xsl:stylesheet>

验证输出

xpath_operators.htm

打印页面