workflow snippet

<serviceTask id="scripttask2" name="Submit" activiti:class="org.alfresco.repo.workflow.activiti.script.AlfrescoScriptDelegate">
    <extensionElements>
                <activiti:field name="runAs">
                    <activiti:string>
                        <![CDATA[system]]>
                    </activiti:string>
                </activiti:field>
                <activiti:field name="script">
                    <activiti:string>
                        <![CDATA[ .... ]]>
                    </activiti:string>
                </activiti:field>
     </extensionElements>
</serviceTask>