public IDictionary<string, LinkedList<IPersistentRepresentation>> Update(
	string pid,
	long seqNr,
	Func<IPersistentRepresentation, IPersistentRepresentation> updater
)

member Update : 
        pid : string * 
        seqNr : int64 * 
        updater : Func<IPersistentRepresentation, IPersistentRepresentation> -> IDictionary<string, LinkedList<IPersistentRepresentation>>