sclass Node extends Concept {
  S globalID = isTrue(DynamicObject_loading.get()) ? null : aGlobalID();
  S importedFrom; // computer or snippet ID
  S originatingUniverse; // global ID of "universe" concept was created in
  bool exportable = true;
  new Ref<PNGFile> pngFile;
  S imageMD5, suggestedImageMD5;
  new Ref<PNGFile> suggestedImage;
  bool searchedForSuggestedImage;
  long imported, touched; // timestamps
  long dataLength; // length of optional byte data (wherever it is stored)
  bool dataIsText; // can optional data be shown as text
}

sclass AIConcept extends Node {
  S name;
  S comment;
}