int
_setNamespaceNULL(self )
        SV * self
    PREINIT:
        xmlNodePtr node = PmmSvNode(self);
    INIT:
        if ( node == NULL ) {
            croak( "lost node" );
        }
    CODE:
        xmlSetNs(node, NULL);
        RETVAL = 1;
    OUTPUT:
        RETVAL