Miscellany

$xml = $dom->dump_mem(true);

$xsl =  join('',file('lib/templates/xslt/calculator.xsl'));

// Allocate a new XSLT processor handler	
$xh = xslt_create();

$arguments = array(
		     '/_xml' => $xml,
		     '/_xsl' => $xsl
		);
		
if ($result = xslt_process($xh, 'arg:/_xml', 'arg:/_xsl', NULL, $arguments)) {
	echo $result;
}