xquery in php using zorba

See more:

XML

PHP

i have been trying to use xquery in php using zorba no luck at all :(
i installed the zorba Windows and copied the zorba_api.dll to the php extension directory and add this line in the php.ini
extension=zorba_api.dll
and tried the hello word example

<?php 
require_once 'Zorba/XQueryProcessor.php'; 

$xquery = new XQueryProcessor(); 

$query = <<<'XQ'
  declare variable $world external; 
  <h1>Hello {$world}</h1>
XQ; 

$xquery->importQuery($query); 

$xquery->setVariable('world', 'World!'); 

echo $xquery->execute(); 
?>

but i get this error :(
Parse error: syntax error, unexpected $end
help pleas