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// not synchronized
sclass WebThoughtSpace {
  S globalID;
  
  class Webs extends NotifyingList<Web> {
    *() { super(new L); }
    *(L<Web> l) { super(l); }
    
    void change() {
      if (index != null) print("Clearing index");
      index = null;
      websByID = null;
    }
    
    public synchronized L<Web> subList(int i, int j) {
      ret new Webs(list.subList(i, j));
    }
  }

  new Webs webs;
  transient Map<S, Web> websByID;
  transient MultiMap<S, WebNode> index;
  new L<Web> openQuestions;
  
  *() {}
  *(Web... webs) {
    addAll(this.webs, webs);
  }
  
  void addWeb(Web web) { webs.add(web); }
  
  L<WebNode> indexedNodes(S query) {
    if (index == null)
      index = ai_indexWebs(webs);
    ret index.get(query);
  }
}