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When Attribute

The when attribute is a boolean expression that is evaluated before preforming an action. If the expression (written in python) evaluates to true, the action will be preformed, otherwhys the action is skipped.

Examples

<StateModel name="StateModel" initialState="InitialState">
        <State name="InitialState">
                <Action type="input">
                        <DataModel ref="InputModel" />
                </Action>

                <Action type="changeState" ref="State2" when="int(StateModel.states['InitialState'].actions[0].dataModel['Type'].InternalValue) == 2"/>

                <Action type="changeState" ref="State3" when="int(StateModel.states['InitialState'].actions[0].dataModel['Type'].InternalValue) == 3"/>

        </State>

        <State name="State2">
                <Action type="output">
                        <DataModel ref="OutputModelA" />
                </Action>
        </State>

        <State name="State3">
                <Action type="output">
                        <DataModel ref="OutputModelB" />
                </Action>
        </State>