type itemkeyhandler [display="Item Key Handler"]
{
  i32 key [ui, readonly, display="Key"];
  i32 action_ptr [ui, readonly, display="Action Ptr"];
  i32 next_ptr [ui, readonly, display="Next Ptr"];

  // Parse inline action
  if (action_ptr == -1) {
    action = cstring() [ui, readonly, display="Action"];
  }

  // Parse inline next handler (linked list)
  if (next_ptr == -1) {
    next = parse_here("itemkeyhandler");
  }
}