<camunda:inputOutput xmlns:camunda="http://activiti.org/bpmn">
    <camunda:inputParameter name="var1">
      <camunda:list>
        <camunda:value>constantStringValue</camunda:value>
        <camunda:value>${ 'elValue' }</camunda:value>
        <camunda:script scriptFormat="Groovy">
          <![CDATA[
            return "scriptValue";
          ]]>
        </camunda:script>
      </camunda:list>
    </camunda:inputParameter>
</camunda:inputOutput>