plone.app.discussion/plone/app/discussion/profiles/default/workflows/comment_review_workflow/definition.xml

<?xml version="1.0"?>
<dc-workflow xmlns:i18n="http://xml.zope.org/namespaces/i18n"
             i18n:domain="plone"
             workflow_id="comment_review_workflow"
             title="Comment Review Workflow"
             description="A simple review workflow for comments"
             state_variable="review_state"
             initial_state="pending"
             i18n:attributes="title; description">
             <permission>Access contents information</permission>
             <permission>Modify portal content</permission>
             <permission>Reply to item</permission>
             <permission>View</permission>
             <state state_id="pending" title="Pending">
                 <description>Submitted, pending review.</description>
                 <exit-transition transition_id="mark_as_spam"/>
                 <exit-transition transition_id="publish"/>
                 <exit-transition transition_id="reject"/>
                 <permission-map name="Access contents information" acquired="False">
                     <permission-role>Manager</permission-role>
                     <permission-role>Owner</permission-role>
                     <permission-role>Reviewer</permission-role>
                     <permission-role>Site Administrator</permission-role>
                 </permission-map>
                 <permission-map name="Modify portal content" acquired="False">
                     <permission-role>Manager</permission-role>
                     <permission-role>Owner</permission-role>
                     <permission-role>Reviewer</permission-role>
                     <permission-role>Site Administrator</permission-role>
                 </permission-map>
                 <permission-map name="Reply to item" acquired="False">
                 </permission-map>
                 <permission-map name="View" acquired="False">
                     <permission-role>Manager</permission-role>
                     <permission-role>Owner</permission-role>
                     <permission-role>Reviewer</permission-role>
                     <permission-role>Site Administrator</permission-role>
                 </permission-map>
             </state>
             <state state_id="published" title="Published">
                 <description>Visible to everyone, non-editable.</description>
                 <exit-transition transition_id="mark_as_spam"/>
                 <exit-transition transition_id="recall"/>
                 <exit-transition transition_id="reject"/>
                 <permission-map name="Access contents information" acquired="True">
                 </permission-map>
                 <permission-map name="Modify portal content" acquired="False">
                     <permission-role>Manager</permission-role>
                     <permission-role>Site Administrator</permission-role>
                 </permission-map>
                 <permission-map name="Reply to item" acquired="True">
                 </permission-map>
                 <permission-map name="View" acquired="True">
                 </permission-map>
             </state>
             <state state_id="rejected" title="Rejected">
                 <exit-transition transition_id="mark_as_spam"/>
                 <exit-transition transition_id="publish"/>
                 <exit-transition transition_id="recall"/>
             </state>
             <state state_id="spam" title="Spam">
                 <exit-transition transition_id="publish"/>
                 <exit-transition transition_id="recall"/>
                 <exit-transition transition_id="reject"/>
             </state>
             <transition transition_id="mark_as_spam" title="Mark as spam" new_state="spam" trigger="USER" before_script="" after_script="">
                 <description>Spam comments are invisible to other users.</description>
                 <action url="%(content_url)s/content_status_modify?workflow_action=mark_as_spam" category="workflow" icon="">Spam</action>
                 <guard>
                     <guard-permission>Review comments</guard-permission>
                 </guard>
             </transition>
             <transition transition_id="publish" title="Reviewer approves content" new_state="published" trigger="USER" before_script="" after_script="">
                 <description>Approving the comment makes it visible to other users.</description>
                 <action url="%(content_url)s/content_status_modify?workflow_action=publish" category="workflow" icon="">Approve</action>
                 <guard>
                     <guard-permission>Review comments</guard-permission>
                 </guard>
             </transition>
             <transition transition_id="recall" title="Reviewer recalls comment back to pending state" new_state="pending" trigger="USER" before_script="" after_script="">
                 <action url="%(content_url)s/content_status_modify?workflow_action=recall" category="workflow" icon="">Recall</action>
                 <guard>
                     <guard-permission>Review comments</guard-permission>
                 </guard>
             </transition>
             <transition transition_id="reject" title="Reviewer rejects comment" new_state="rejected" trigger="USER" before_script="" after_script="">
                 <description>Rejected comments are invisible to other users.</description>
                 <action url="%(content_url)s/content_status_modify?workflow_action=reject" category="workflow" icon="">Reject</action>
                 <guard>
                     <guard-permission>Review comments</guard-permission>
                 </guard>
             </transition>
             <variable variable_id="action" for_catalog="False" for_status="True" update_always="True">
                 <description>Previous transition</description>
                 <default>

                     <expression>transition/getId|nothing</expression>
                 </default>
                 <guard>
                 </guard>
             </variable>
             <variable variable_id="actor" for_catalog="False" for_status="True" update_always="True">
                 <description>The ID of the user who performed the previous transition</description>
                 <default>

                     <expression>user/getUserName</expression>
                 </default>
                 <guard>
                 </guard>
             </variable>
             <variable variable_id="comments" for_catalog="False" for_status="True" update_always="True">
                 <description>Comment about the last transition</description>
                 <default>

                     <expression>python:state_change.kwargs.get('comment', '')</expression>
                 </default>
                 <guard>
                 </guard>
             </variable>
             <variable variable_id="review_history" for_catalog="False" for_status="False" update_always="False">
                 <description>Provides access to workflow history</description>
                 <default>

                     <expression>state_change/getHistory</expression>
                 </default>
                 <guard>
                     <guard-permission>Request review</guard-permission>
                     <guard-permission>Review portal content</guard-permission>
                 </guard>
             </variable>
             <variable variable_id="time" for_catalog="False" for_status="True" update_always="True">
                 <description>When the previous transition was performed</description>
                 <default>

                     <expression>state_change/getDateTime</expression>
                 </default>
                 <guard>
                 </guard>
             </variable>
         </dc-workflow>