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<?PHP
/**
 * This example shows how to add a DocType Declaration to the XML document
 *
 * @author Stephan Schmidt <[email protected]>
 */
error_reporting(E_ALL);

require_once 'XML/Serializer.php';

$options = array(
                    'indent'     => '    ',
                    'linebreak'  => "\n",
                    'addDecl'    => true,
                    'addDoctype' => true,
                    'doctype'    => array(
                                            'uri' => 'http://pear.php.net/dtd/package-1.0',
                                            'id' => '-//PHP//PEAR/DTD PACKAGE 0.1'
                                         )
                );

$serializer = new XML_Serializer($options);

$foo = PEAR::raiseError('Just a test', 1234);    

$result = $serializer->serialize($foo);

if( $result === true ) {
    echo '<pre>';
    echo htmlentities($serializer->getSerializedData());
    echo '</pre>';
}
?>