WOLFRAM SYSTEM MODELER
    Step_in_forAlternativeInput port of a step (has special icon for usage in component 'Alternative')  | 
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SystemModel["Modelica.StateGraph.Alternative.Step_in_forAlternative"]

| occupied | 
         Causality: Output Type: Boolean Description: = true, if step is active  | 
    
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| set | 
         Causality: Input Type: Boolean Description: = true, if transition fires and step is activated  | 
    
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         Modelica.StateGraph Alternative splitting of execution path (use component between two steps)  |