In-goal is the area bounded by a goal line, touch-in-goal
lines and dead-ball line. It includes the goal line and goal posts
but excludes touch-in-goal lines and dead-ball line.
Touch-in-goal occurs when the ball or a player carrying it
touches a corner post or a touch-in-goal line or the ground or
a person or object on or beyond it. The flag is not part of the
corner post.