如何使用XSLT处理给定的汽车目录XML源文件以生成输出？

Alright, let's walk through exactly how to use XSLT to turn your car catalog XML into a usable output—we'll use HTML as the target format since it's the most common and easy-to-view option.

Step 1: Your Complete XML Input #

First, here's your original XML with the truncated Mercedes ClassB entry filled in for testing:

<?xml version="1.0" encoding="UTF-8"?>
<catalog>
  <car>
    <brand>Mercedes</brand>
    <type>ClassA</type>
    <engine>Diesel</engine>
    <seats>5</seats>
  </car>
  <car>
    <brand>Audi</brand>
    <type>A8</type>
    <engine>Diesel</engine>
    <seats>2</seats>
  </car>
  <car>
    <brand>Mercedes</brand>
    <type>ClassB</type>
    <engine>Petrol</engine>
    <seats>5</seats>
  </car>
</catalog>

Step 2: Create the XSLT Style Sheet #

This XSLT file defines how to map your XML elements to structured HTML. Save it as car-catalog.xsl:

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

  <!-- Root template: matches the top-level <catalog> and builds the HTML framework -->
  <xsl:template match="/catalog">
    <html>
      <head>
        <title>Car Catalog</title>
        <style>
          table { border-collapse: collapse; width: 80%; margin: 20px auto; }
          th, td { border: 1px solid #ddd; padding: 8px; text-align: left; }
          th { background-color: #f2f2f2; }
        </style>
      </head>
      <body>
        <h1 style="text-align:center;">Car Catalog</h1>
        <table>
          <tr>
            <th>Brand</th>
            <th>Model Type</th>
            <th>Engine Type</th>
            <th>Number of Seats</th>
          </tr>
          <!-- Loop through every <car> entry in the catalog -->
          <xsl:for-each select="car">
            <tr>
              <!-- Pull and insert values from each XML child element -->
              <td><xsl:value-of select="brand"/></td>
              <td><xsl:value-of select="type"/></td>
              <td><xsl:value-of select="engine"/></td>
              <td><xsl:value-of select="seats"/></td>
            </tr>
          </xsl:for-each>
        </table>
      </body>
    </html>
  </xsl:template>

</xsl:stylesheet>

Key Parts Explained #

• Root Template: Targets the top <catalog> element and sets up the full HTML document structure.
• <xsl:for-each>: Iterates over every <car> entry, so you don't have to write code for each individual vehicle.
• <xsl:value-of>: Extracts text content from XML elements (like brand or seats) and inserts it into the HTML table.
• Inline CSS: Adds basic styling to make the output clean—tweak this to match your design needs.

Step 3: Preview in a Browser #

To see the transformed output instantly, add a processing instruction to link your XML to the XSLT file, right after the XML declaration:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="car-catalog.xsl"?>
<catalog>
  <!-- Rest of your XML content -->
</catalog>

Save both files in the same folder, then open the XML file in a modern browser—you'll see a formatted HTML table of your car catalog.

Step 4: Alternative Transformation Methods #

If you need to generate output programmatically or via command line:

• Command Line: Use tools like xsltproc (preinstalled on most Linux/macOS systems) or msxsl (Windows). Example with xsltproc:

  xsltproc car-catalog.xsl car-catalog.xml > output.html
  

• Programming Languages: Use libraries like:
  • Python: lxml library's XSLT class
  • Java: javax.xml.transform API
  • C#: System.Xml.Xsl namespace

Quick Customization Tips #

• Plain Text Output: Replace the HTML structure with line-separated values for a simple text list.
• Filter Cars: Add an <xsl:if> inside the loop to show only specific vehicles, e.g.:

  <xsl:if test="engine = 'Diesel'">
    <!-- Only output diesel-powered cars -->
  </xsl:if>
  

• Sort Entries: Use <xsl:sort> inside the loop to order cars by brand or seat count:

  <xsl:for-each select="car">
    <xsl:sort select="brand"/>
    <!-- Rest of the table row code -->
  </xsl:for-each>
  

内容的提问来源于stack exchange，提问作者Azygous92