https://www.php.net/manual/de/domelement.getelementsbytagnamens.php
PHP: DOMElement::getElementsByTagNameNS - Manual
Get elements by namespaceURI and localName
phpdomelementgetelementsbytagnamensmanual
https://www.php.net/manual/en/domdocument.getelementsbytagnamens.php
PHP: DOMDocument::getElementsByTagNameNS - Manual
Searches for all elements with given tag name in specified namespace
phpdomdocumentgetelementsbytagnamensmanual