private void toXml(XmppStreamWriter out, DataOption option)
      throws IOException, XMLStreamException {
    out.writeStartElement("option");

    if (option.getLabel() != null) out.writeAttribute("label", option.getLabel());

    DataValue[] values = option.getValue();
    if (values != null) {
      for (int i = 0; i < values.length; i++) {
        DataValue value = values[i];

        out.writeStartElement("value");
        out.writeCharacters(value.getValue());
        out.writeEndElement(); // </value>
      }
    }

    out.writeEndElement(); // </option>
  }
  /** Deserializes the object from XML */
  public DataOption parseOption(XMLStreamReader in) throws IOException, XMLStreamException {
    String label = in.getAttributeValue(null, "label");

    DataOption option = new DataOption(label);

    ArrayList<DataValue> valueList = new ArrayList<DataValue>();

    int tag = in.nextTag();
    while (tag > 0) {
      if (_isFinest) debug(in);

      if (XMLStreamReader.END_ELEMENT == tag) {
        option.setValueList(valueList);

        return option;
      }

      if (XMLStreamReader.START_ELEMENT == tag && "value".equals(in.getLocalName())) {
        String value = in.getElementText();

        valueList.add(new DataValue(value));

        skipToEnd(in, "value");
      } else if (XMLStreamReader.START_ELEMENT == tag) {
        log.finer(this + " <" + in.getLocalName() + "> is an unknown tag");

        skipToEnd(in, in.getLocalName());
      }

      tag = in.nextTag();
    }

    skipToEnd(in, "option");

    return option;
  }