How to let JAXB render boolean as 0 and 1, not true and false

public boolean myParseBool(String s)
{
    return s.equals("1");
}

public String myPrintBool(boolean b)
{
    return b ? "1" : "0";
}

import javax.xml.bind.annotation.adapters.XmlAdapter;

public class BooleanAdapter extends XmlAdapter<Integer, Boolean>
{
    @Override
    public Boolean unmarshal( Integer s )
    {
        return s == null ? null : s == 1;
    }

    @Override
    public Integer marshal( Boolean c )
    {
        return c == null ? null : c ? 1 : 0;
    }
}

@XmlElement( name = "enabled" )
@XmlJavaTypeAdapter( BooleanAdapter.class )
public Boolean getEnabled()
{
    return enabled;
}