transient srecord noeq G22NetworkInstance(G22Network network) {
  new Map<S, Value> valuesByIdentifier;
  new Map<G22NetworkElement, Value> valuesByBlueprint;
  
  sclass Value {
    settable O object; // the actual value calculated by the node
    settable Timestamp calculatedWhen; // when the value was calculated
    
    O get() { ret object; }
  }
  
  void makeInstance(G22Utils g22utils, G22NetworkElement e) {
    if (e == null) ret;
    
    O instance = e.makeInstance(g22utils, this);
    print("Calculated: " + instance);
    
    if (instance != null) {
      new Value value;
      value.object(instance).calculatedWhen(tsNow());
      valuesByBlueprint.put(e, value);
      mapPut(valuesByIdentifier, e.identifier(), value);
    }
  }
  
  void init(G22Utils g22utils) {
    // This is in wrong order anyway
    for (e : network.elements)
      makeInstance(g22utils, e);
  }
  
  O getObjectForBlueprint(G22NetworkElement element) {
    var value = valuesByIdentifier.get(element);
    ret value?!;
  }
}