dditional fields. But we reuse the converters registered in XStream for our member fields and handle
<code>null</code> values:
</p><div class="Source Java"><pre>package com.thoughtworks.xstream.examples;

import java.util.Calendar;

import com.thoughtworks.xstream.converters.ConversionException;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.i