case classRequestedArc(token1: Int, token2: Int, arcLabel: Option[Symbol] = None) extends TransitionConstraint with Product with Serializable
A RequestedArc constraint requests that the output parse MUST contain the requested arc.
The arc is specified using the index of the token at the arc's head followed by the index of
the token at the arc's tail.
Note: currently this constraint does not pay attention to the arc direction, nor the arc
label. It only enforces that that there is some edge between the two specified tokens.
A RequestedArc constraint requests that the output parse MUST contain the requested arc.
The arc is specified using the index of the token at the arc's head followed by the index of the token at the arc's tail.
Note: currently this constraint does not pay attention to the arc direction, nor the arc label. It only enforces that that there is some edge between the two specified tokens.
index of the first token
index of the second token
desired label for the arc