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- user edges: these edges tell the system to wait for a certain event before traversing them. If a state has one outgoing edge that is a user edge, then all outgoing edges of that state will be user edge. this property make a state a user waiting state that blocks the execution of the action until the user says any of the events in the outgoing user edges.
- system edges: these edge when traversed make the system say a particular utterance. System edges take time to be traversed: the time taken by the associated system utterances to be played (one can configure to ignore this waiting but the default is to wait for a system edge to finish playing the associated animation).
- condition edges: these edges are used to connect state when we don't want to wait for an event and we don't want the virtual human to say anything.
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- wait edges:
| Anchor | ||||
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- an information state update. That is, changing the value of some variable in the information state when the node containing the effect is entered.
- a reward. A reward can be a numeric constant or an expression returning a number. When the state containing a reward is reached, the system achieves the associated reward. A sub-dialogue can have multiple rewards associated to multiple states.
- swap out the current sub-dialog (force the sub-dialogue to go from ACTIVE to DORMANT state).
In the example of sub-dialogue given here the red nodes are states with effects. These states can be inspected to display the particular effects associated with them. This graphical representation of a sub-dialogue is generated for debug purposes, it's not used to edit the sub-dialogue, just to check that the intended form is correctly generated from the provided information.
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User and system actions can be followed by an optional condition that specifies further restrictions on when that edge can be taken. For system actions the semantics of the optional condition is slightly different: the edge will be traversed no matter what, but the line associated to the edge will not be said if the condition is false. So the system line with condition should be read as "say this if this is true". The user line with condition should be read as "wait for this event and this should also be true".
Effects:
Line 6 attaches the reward effect to the state reached after the system edge is executed. This reward effect says that the reward associated tot he defined goal named simple will be achieved when the execution reaches that point on the sub-dialogue tree.
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