I/O mapping

bpmnIoMapping.xml

<bpmn2:serviceTask id="requestScore" name="Request Rating Score">

  <bpmn2:extensionElements>
    <camunda:inputOutput>
        <camunda:inputParameter name="customer">${ XML(customers).xPath('/customers/customer[1]').element() }</camunda:inputParameter>
        <camunda:inputParameter name="requestedAmount">${ amount }</camunda:inputParameter>
        <camunda:inputParameter name="someData">
          <camunda:map>
            <camunda:entry key="a">${b}</camunda:entry>
            <camunda:entry key="c">${d}</camunda:entry>
          </camunda:map>
        </camunda:inputParameter>
        <camunda:outputParameter name="score">${ XML(result).childElement("rating") }</camunda:inputParameter>
    </camunda:inputOutput>
  </bpmn2:extensionElements>

</bpmn2:serviceTask>