public StepEntityInstanceReferenceSyntax(StepEntityInstanceToken itemInstance)
     : base(itemInstance.Line, itemInstance.Column)
 {
     Id = itemInstance.Id;
 }
 public StepEntityInstanceSyntax(StepEntityInstanceToken instanceId, StepItemSyntax itemInstance)
     : base(instanceId.Line, instanceId.Column)
 {
     Id = instanceId.Id;
     SimpleItemInstance = itemInstance;
 }