examples.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->

<chapter xml:id="xsl.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.examples;
 <section xml:id="xsl.examples-collection">
  <title>Example collection.xml and collection.xsl files</title>
  <para>
   Many examples in this reference require both an XML and an XSL file.
   We will use <filename>collection.xml</filename> and 
   <filename>collection.xsl</filename> that contains the following:
  </para>
  <para>
   <example>
    <title>collection.xml</title>
    <programlisting role="xml">
<![CDATA[
<collection>
 <cd>
  <title>Fight for your mind</title>
  <artist>Ben Harper</artist>
  <year>1995</year>
 </cd>
 <cd>
  <title>Electric Ladyland</title>
  <artist>Jimi Hendrix</artist>
  <year>1997</year>
 </cd>
</collection>
]]>
    </programlisting>
   </example>
   <example>
    <title>collection.xsl</title>
    <programlisting role="xml">
<![CDATA[
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:param name="owner" select="'Nicolas Eliaszewicz'"/>
 <xsl:output method="html" encoding="iso-8859-1" indent="no"/>
 <xsl:template match="collection">
  Hey! Welcome to <xsl:value-of select="$owner"/>'s sweet CD collection! 
  <xsl:apply-templates/>
 </xsl:template>
 <xsl:template match="cd">
  <h1><xsl:value-of select="title"/></h1>
  <h2>by <xsl:value-of select="artist"/> - <xsl:value-of select="year"/></h2>
  <hr />
 </xsl:template>
</xsl:stylesheet>
]]>
    </programlisting>
   </example>
  </para>
 </section>

 <section xml:id="xsl.examples-errors">
  <title>Error handling with libxml error handling functions</title>
  <para>
   libxml offers a number of functions for handling errors, which can be
   employed to capture and deal with errors in XSLT processing.
  </para>
  <para>
   <example>
    <title>fruits.xml</title>
    <para>A valid XML file.</para>
    <programlisting role="xml">
<![CDATA[
<fruits>
 <fruit>Apple</fruit>
 <fruit>Banana</fruit>
 <fruit>Cherry</fruit>
</fruits>
]]>
    </programlisting>
   </example>
   <example>
    <title>fruits.xsl</title>
    <para>Contains an invalid select expression.</para>
    <programlisting role="xml">
<![CDATA[
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="html" encoding="utf-8" indent="no"/>
 <xsl:template match="fruits">
  <ul>
   <xsl:apply-templates/>
  </ul>
 </xsl:template>
 <xsl:template match="fruit">
  <li><xsl:value-of select="THIS IS A DELIBERATE ERROR!"/></li>
 </xsl:template>
</xsl:stylesheet>
]]>
    </programlisting>
   </example>
   <example xml:id="xsl.examples-errors.capture">
    <title>Collating and printing errors</title>
    <para>
     The example below captures and displays libxml errors raised when calling
     <methodname>XSLTProcessor::importStyleSheet</methodname> with a
     stylesheet containing an error.
    </para>
    <programlisting role="php">
<![CDATA[
<?php

$xmldoc = new DOMDocument();
$xsldoc = new DOMDocument();
$xsl = new XSLTProcessor();

$xmldoc->loadXML('fruits.xml');
$xsldoc->loadXML('fruits.xsl');

libxml_use_internal_errors(true);
$result = $xsl->importStyleSheet($xsldoc);
if (!$result) {
    foreach (libxml_get_errors() as $error) {
        echo "Libxml error: {$error->message}\n";
    }
}
libxml_use_internal_errors(false);

if ($result) {
    echo $xsl->transformToXML($xmldoc);
}

?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Libxml error: Invalid expression

Libxml error: compilation error: file fruits.xsl line 9 element value-of
Libxml error: xsl:value-of : could not compile select expression 'THIS IS A DELIBERATE ERROR!'
]]>
    </screen>
   </example>
  </para>
 </section>

</chapter>
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