The CRUD: Update Web service is used to update a published revision of an instance record. The service may also be used to create a new (unpublished) revision of an instance record. (Unpublished revisions may subsequently be changed to a published status, a feature useful for testing or draft purposes.)
Developers communicate with the CRUD: Update Web service using the HTTP POST method. You may request any of the available content types (*/*).
For full documentation on this Web service, see CRUD Update.