It could be useful to have a dedicated link relation type for MUD URLs. This way, MUD URLs pointing to a MUD fileserver could be linked like so: <https://www.example.com/mudfile>;rel="mud";rt="mud";anchor="/". In this example, an anchor parameter with a value of "/" is used to indicate that the root resource (and therefore the device as a whole) is described by the MUD file the link is pointing to. Maybe the relation type describes could also be used instead.