Sub class of TraCICommand which represents a get request to some API. An API in this context is for instance the Person(GET/SET), Simulation(GET/SET/SUB) Command Structure [ cmdIdentifier(based on API) ] [ variableId ] [ elementId] - cmdIdentifier(based on API): see TraCICmd enum GET_**** - variableId: Id for the var. The numbers may be the same between different APIs see PersonVar enum - elementId: String based id for the object (i.e. a pedestrianId) see PersonCommandHandler for execution handing.