code: public static IoMapping parseInputOutput(Element element) {
      Element inputOutputElement = element.elementNS(BpmnParse.CAMUNDA_BPMN_EXTENSIONS_NS, "inputOutput");
      if(inputOutputElement != null) {
        IoMapping ioMapping = new IoMapping();
        parseCamundaInputParameters(inputOutputElement, ioMapping);
        parseCamundaOutputParameters(inputOutputElement, ioMapping);
        return ioMapping;
      }
      return null;
    }
docs: Returns the {@link IoMapping} of an element.
  
  @param element the element to parse
  @return the input output mapping or null if non defined
  @throws BpmnParseException if a input/output parameter element is malformed