(PHP 4 >= 4.3.0)
DomNode::set_namespace — Sets namespace of a node
$uri
[, string $prefix
] )
Sets the namespace of a node to uri.
If there is already a namespace declaration with the same uri in one of the parent nodes
of the node, the prefix of this is taken, otherwise it will take the one provided
in the optional parameter prefix or generate a random one.
See also domdocument_create_element_ns(), and domnode_add_namespace()