(PHP 5)
DOMElement::setIdAttribute — Declares the attribute specified by name to be of type ID
$name
   , bool $isId
   )
   Declares the attribute name to be of type ID.
  
name
     The name of the attribute.
isId
     
       Set it to TRUE if you want name to be of type
       ID, FALSE otherwise.
      
No value is returned.
DOM_NO_MODIFICATION_ALLOWED_ERR
     Raised if the node is readonly.
DOM_NOT_FOUND
     
       Raised if name is not an attribute of this element.