| ApiEditMassMessageListResponse | Response of action=editmassmessagelist. |
| ApiEditMassMessageListResult | The editmassmessagelist object of an action=editmassmessagelist response. |
| ApiMassMessageInvalidTarget | One invalid target of invalidadd: the submitted string under * plus an empty-string entry per error code (e.g. invalidsite, invalidtitle). invalidremove reports plain strings and an unchanged description comes back as a plain string under invaliddescription. |
| ApiMassMessageResponse | Response of action=massmessage (requires the massmessage right). |
| ApiMassMessageResult | The massmessage object of an action=massmessage response. |
| ApiMassMessageTarget | One valid target echoed back by action=editmassmessagelist. |
| ApiMmContent | The mmcontent object of a prop=mmcontent response. |