Core Tags
1. <xsl:value-of>
Purpose: Extract text content from the specified XML node and output it to the result document.
<!-- Directly fetch the title value under the first catalog/cd (only gets first entry without loop) -->
<xsl:value-of select="catalog/cd/title" />Code language: HTML, XML (xml)When used without the <xsl:for-each> loop, only the first matching node will be retrieved, and full‑data iteration is unavailable.
2. <xsl:for-each>
Purpose: Iterate over a set of matched XML nodes to process multiple records in batches.
<xsl:for-each select="class/student">
<li><xsl:value-of select="name"/>；<xsl:value-of select="age"/></li>
</xsl:for-each>Code language: HTML, XML (xml)XPath Filter Syntax
Append [condition] after the select path to filter nodes and implement data filtering.
<!-- Output only cd records where artist equals Bob Dylan -->
<xsl:for-each select="catalog/cd[artist='Bob Tom']">Code language: HTML, XML (xml)Supported Operators
| Operator | XPath Syntax | Meaning |
|---|---|---|
| = | = | Equal to |
| != | != | Not equal to |
| < | < | Less than (do not write < directly; escaping is mandatory) |
| > | > | Greater than (do not write > directly; escaping is mandatory) |
Example: filter CDs with price less than 10
<xsl:for-each select="catalog/cd[price < 10]">Code language: HTML, XML (xml)Previous Example
student.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>
<head>
</head>
<body>
<ul>
<!-- Iterate all student nodes -->
<xsl:for-each select="class/student">
<li><xsl:value-of select="name"/>；<xsl:value-of select="age"/></li>
</xsl:for-each>
</ul>
</body>
</html>
</xsl:template>
</xsl:stylesheet>Code language: HTML, XML (xml)Associated XML (student.xml)
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="student.xsl"?>
<class>
<student>
<name>Jack</name>
<age>16</age>
</student>
<student>
<name>Jim</name>
<age>12</age>
</student>
</class>Code language: HTML, XML (xml)Add Filtering
Only output students older than 14
<xsl:for-each select="class/student[age > 14]">
<li><xsl:value-of select="name"/>；<xsl:value-of select="age"/></li>
</xsl:for-each>Code language: HTML, XML (xml)Loop
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