function create_node( $s ){
		if( isset($this->node_classes[$s]) ){
			// custom node class
			$class = $this->node_classes[$s];
		}	
		else {
			// vanilla flavour node
			$class = $this->default_node_class;
		}
		return new $class( $s );
	}
function create_node( $s ){
		if( isset($this->node_classes[$s]) ){
			// custom node class
			$class = $this->node_classes[$s];
		}	
		else {
			// vanilla flavour node
			$class = $this->default_node_class;
		}
		return new $class( $s );
	}
function create_node ( $ s ) { if ( isset ( $ this -> node_classes [ $ s ] ) ) { // custom node class $ class = $ this -> node_classes [ $ s ] ; } else { // vanilla flavour node $ class = $ this -> default_node_class ; } return new $ class ( $ s ) ; }
Create a Parse Node according to registered symbol
@param mixed scalar symbol
@return ParseNode
Create a Parse Node according to registered symbol