Guard

A guard is an expression that evaluates to a boolean value. Guards are used within transitions to determine whether a transition is taken.

new Guard {
  expression = "v==5"
}

Listing 5: A Guard construct.

The following keywords can/must be provided:

Keyword	Description	Type	Optional
expression	The guard expression.	Expression	No

The expression keyword specifies the guard expression.

Rule

The guard expression must evaluate to a boolean value.