It seems that this method is currently (version 4.2.1) not implemented.
DomNode::prefix
(PHP 4 >= 4.1.0)
DomNode::prefix — Returns name space prefix of node
Descrição
string DomNode::prefix
( void
)
Returns the name space prefix of the node.
User Contributed Notes
DomNode::prefix
DomNode::prefix
sondberg at indexdata dot dk
15-May-2002 08:22
15-May-2002 08:22

DomNode::parent_node