seqdiag {

  === show ===

  browser ->  client           [label="open group info"]
              client -> server [label="get last protocol for that group"]
                        server -> server [label="collect ids + info of metacategories in current protocol"]
              client <- server [label="list of indexed metacategories"]
  browser <-  client           [label="render list of metacategories in current protocol"]

  === edit ===

  browser ->  client            [label="edit existing metacategory"]
              client -> client  [label="stack changes"]
  browser <-  client [label="activate submit button"]

  browser  -> client            [label="add new metacategory"]
              client -> client  [label="add new line to list of metacategories"]
  browser  <- client            [label="(if not) activate submit button"]

  === submit ===

  browser -> client            [label="submit new list of metacategories"];
  client --> browser           [label="set form as not editable and notify loading"];

            client -> server  [label="write new protocol"]
                       server -> server [label="generate new protocol id"]
                       server --> server [label="create new metacategories"]
                       server -> server [label="create new version of updated metacategories"]
             client <- server  [label="return new protocol id and list of indexed metacategories"]
  browser <-- client           [label="set form as editable but not submitable (no change)"]

}