/** {@inheritDoc} */
  @Override
  protected void readChild(FreeColXMLReader xr) throws XMLStreamException {
    final Game game = getGame();
    final String tag = xr.getLocalName();

    if (ALARM_TAG.equals(tag)) {
      Player player = xr.findFreeColGameObject(game, PLAYER_TAG, Player.class, (Player) null, true);
      // @compat 0.10.5
      if (getName() != null) {
        // Alarm used to imply contact, but only set contacted if
        // we also have a valid name for the settlement.
        setContacted(player);
      }
      // end @compat
      alarm.put(player, new Tension(xr.getAttribute(VALUE_TAG, 0)));
      xr.closeTag(ALARM_TAG);

    } else if (CONTACT_LEVEL_TAG.equals(tag)) {
      ContactLevel cl = xr.getAttribute(LEVEL_TAG, ContactLevel.class, ContactLevel.UNCONTACTED);
      Player player = xr.findFreeColGameObject(game, PLAYER_TAG, Player.class, (Player) null, true);
      contactLevels.put(player, cl);
      xr.closeTag(CONTACT_LEVEL_TAG);

      // @compat 0.10.5
    } else if (IS_VISITED_TAG.equals(tag)) {
      Player player = xr.findFreeColGameObject(game, PLAYER_TAG, Player.class, (Player) null, true);
      setScouted(player);
      xr.closeTag(IS_VISITED_TAG);
      // end @compat

    } else if (MISSIONARY_TAG.equals(tag)) {
      xr.nextTag();
      missionary = xr.readFreeColGameObject(game, Unit.class);
      missionary.setLocationNoUpdate(this);
      xr.closeTag(MISSIONARY_TAG);

      // @compat 0.10.1
    } else if (OLD_UNITS_TAG.equals(tag)) {
      while (xr.nextTag() != XMLStreamConstants.END_ELEMENT) {
        super.readChild(xr);
      }
      // end @compat

    } else if (OWNED_UNITS_TAG.equals(tag)) {
      Unit unit = xr.makeFreeColGameObject(game, ID_ATTRIBUTE_TAG, Unit.class, true);
      addOwnedUnit(unit);
      xr.closeTag(OWNED_UNITS_TAG);

    } else {
      super.readChild(xr);
    }
  }
  /** {@inheritDoc} */
  @Override
  protected void readChildren(FreeColXMLReader xr) throws XMLStreamException {
    // Clear containers.
    contactLevels.clear();
    alarm.clear();
    missionary = null;
    ownedUnits.clear();

    super.readChildren(xr);

    // @compat 0.10.1
    for (Unit u : getUnitList()) {
      if (u.getLocation() != this) {
        u.setLocationNoUpdate(this);
        logger.warning("Fixing unit location" + " from " + u.getLocation() + " to " + this.getId());
      }
    }
    // end @compat
  }