(no version information, might be only in CVS)
DOMDocument->getElementsByTagNameNS -- 
     Searches for all elements with given tag name in specified namespace.
    
Description
object 
DOMDocument->getElementsByTagNameNS ( string namespaceURI, string localName)
     This function returns a new instance of class
     DOMNodeList containing the elements with tagnames 
     matching the localName parameter and in the namespaceURI namespace. 
     Use "*" for the name to return all elements within the document.