docs: public static void parseOutputParameterElement(Element outputParameterElement, IoMapping ioMapping) {
      String nameAttribute = outputParameterElement.attribute("name");
      if(nameAttribute == null || nameAttribute.isEmpty()) {
        throw new BpmnParseException("Missing attribute 'name' for outputParameter", outputParameterElement);
      }
  
      ParameterValueProvider valueProvider = parseNestedParamValueProvider(outputParameterElement);
  
      // add parameter
      ioMapping.addOutputParameter(new OutputParameter(nameAttribute, valueProvider));
    }