/**
  * @dataProvider getTestDocuments
  */
 public function testCommonConversions($from, $to)
 {
     if (!is_file($to)) {
         $this->markTestSkipped("Comparision file '{$to}' not yet defined.");
     }
     $document = new ezcDocumentXhtml();
     $document->setFilters(array(new ezcDocumentXhtmlElementFilter(), new ezcDocumentXhtmlMetadataFilter(), new ezcDocumentXhtmlTablesFilter()));
     $document->loadFile($from);
     $docbook = $document->getAsDocbook();
     $xml = $docbook->save();
     // Store test file, to have something to compare on failure
     $tempDir = $this->createTempDir('xhtml_tests_') . '/';
     file_put_contents($tempDir . basename($to), $xml);
     $this->assertTrue($docbook->validateString($xml));
     $this->assertEquals(file_get_contents($to), $xml, 'Document not visited as expected.');
     // Remove tempdir, when nothing failed.
     $this->removeTempDir();
 }
<?php

require 'tutorial_autoload.php';
$xhtml = new ezcDocumentXhtml();
$xhtml->setFilters(array(new ezcDocumentXhtmlElementFilter(), new ezcDocumentXhtmlMetadataFilter(), new ezcDocumentXhtmlXpathFilter('//div[@class="document"]')));
$xhtml->loadFile('ez_components_introduction.html');
$docbook = $xhtml->getAsDocbook();
echo $docbook->save();