function on_populate_xslt ($data)
{
	$format = coren::get_xsl_format();
	if ($format == '') return;

	$files = array();
	if (file_exists($filename = "{$this->dir}.xsl"          )) $files[] = $filename;
	if (file_exists($filename = "{$this->dir}${format}/.xsl")) $files[] = $filename;
	foreach (coren::names() as $identifier)
	if ($identifier != '')
	{
		//???todo: normalize identifier to filename here: all special chars to "_".
		if (file_exists($filename = "{$this->dir}{$identifier}.xsl"          )) $files[] = $filename;
		if (file_exists($filename = "{$this->dir}${format}/{$identifier}.xsl")) $files[] = $filename;
	}

	foreach ($files as $file)
	{
		$xslf = new DOMDocument();
		$xslf->load($file);

		$xslt = coren::xsl();
		//todo: optimize this: remove fragment, append immediately:
		$frag = $xslt->createDocumentFragment();
		for ($i = 0; $i < $xslf->documentElement->childNodes->length; $i++)
			$frag->appendChild($xslt->importNode($xslf->documentElement->childNodes->item($i), true));
		$xslt->documentElement->appendChild($frag);
	}
}