private function getNodesByLowercasePropertyValue(Document $doc, $tag, $property, $value)
{
return $doc->findXPath("descendant::" . $tag . "[translate(@" . $property . ", 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')='" . $value . "']");
}