typedef struct lkb_edge
{
	int		from, to, id, key;
	char	*abbr, *type, *label;	// label is as displayed, usually = id+abbr
	int		ndaughters;
	int		*daughters;
	// XXX should probably precompute what lkb_edge each daughter points to some time

	int		x, y, dx, dy, bold, filter;
}	lkb_edge;

typedef struct lkb_chart_cell
{
	int	from, to;
	int	x, y, dx, dy;
}	lkb_chart_cell;

typedef struct lkb_chart
{
	int		id, size;

	int			nedges;
	lkb_edge	*edges;

	int				ncells;
	lkb_chart_cell	*cells;

	int	hold_selections;
}	lkb_chart;

lkb_chart	*build_chart(int	id, int	size, int	nedges, lkb_edge	**edges);