Description:
------------
When procesing one XSLT stylesheet that try to import multiple XSTL stylesheets
displays only the last one.

Test script:
---------------
$xslDoc = new DOMDocument();
$xslDoc->load("XML/index.xsl");

$xmlDoc = new DOMDocument();
$xmlDoc->load("XML/index.xml");

$proc = new XSLTProcessor();
$proc->importStylesheet($xslDoc);
echo $proc->transformToXML($xmlDoc);

Expected result:
----------------
to import more then one XSLT stylesheet

Actual result:
--------------
display only the last XSLT stylesheet