docs: private QuestionnaireItemType answerTypeForBinding(ElementDefinitionBindingComponent binding) {
      if (binding == null) 
        return QuestionnaireItemType.OPENCHOICE;
      else if (binding.getStrength() != BindingStrength.REQUIRED) 
        return QuestionnaireItemType.OPENCHOICE;
      else
        return QuestionnaireItemType.CHOICE;
    }