(PHP 5, PHP 7, PHP 8)
DOMElement::getAttributeNS — Returns value of attribute
   Gets the value of the attribute in namespace namespace 
   with local name localName for the current node. 
  
namespaceThe namespace URI.
localNameThe local name.
   The value of the attribute, or an empty string if no attribute with the
   given localName and namespace 
   is found.
  
