/// <summary>
/// Saves the node.
/// </summary>
/// <param name="io">[in] The node is written into io.</param>
/// <exception cref="Columbus.ColumbusIOException">Throws ColumbusIOException if there is something wrong with the file.</exception>
public override void save(IO io)
{
base.save(io);
m_position.save(io);
}
