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extend RC {
  transient RemoteDB db;
  
  S getString(S field) { ret db.xS(this, field); }
}

static class RemoteDB {
  DialogIO db;
  
  // s = bot name or snippet ID
  *(S s) {
    if (isSnippetID(s)) s += " Concepts.";
    db = findBot(s);
  }
  
  bool functional() { ret db != null; }
  
  L<RC> list() { ret adopt((L<RC>) rpc(db, "xlist")); }
  L<RC> list(S className) { ret adopt((L<RC>) rpc(db, "xlist", className)); }
  L<RC> xlist() { ret list(); }
  L<RC> xlist(S className) { ret list(className); }
  
  // adopt is an internal method
  L<RC> adopt(L<RC> l) {
    if (l != null) for (RC rc : l) adopt(rc);
    ret l;
  }
  
  RC adopt(RC rc) { if (rc != null) rc.db = this; ret rc; }
  
  S xclass(RC o) {
    ret (S) rpc(db, "xclass", o);
  }
  
  O xget(RC o, S field) {
    ret rpc(db, "xget", o, field);
  }
  
  S xS(RC o, S field) {
    ret (S) xget(o, field);
  }
  
  RC xgetref(RC o, S field) {
    ret adopt((RC) xget(o, field));
  }
  
  void xset(RC o, S field, O value) {
    rpc(db, "xset", o, field, value);
  }
  
  RC uniq(S className) {
    RC ref = first(list(className));
    if (ref == null)
      ref = xnew(className);
    ret ref;
  }
  RC xuniq(S className) { ret uniq(className); }
  
  RC xnew(S className, O... values) {
    ret adopt((RC) rpc(db, "xnew", className, values));
  }
  
  void xdelete(RC o) {
    rpc(db, "xdelete", o);
  }
  
  void xdelete(L<RC> l) {
    rpc(db, "xdelete", l);
  }

  void close() {
    if (db != null)
      db.close();
  }
  
  S fullgrab() { ret (S) rpc(db, "xfullgrab"); }
  S xfullgrab() { ret fullgrab(); }
}