<bind-xml ...>
                   <class name="org.exolab.castor.mapping.MapItem">
                      <field name="key" type="java.lang.String">
                        <bind-xml name="id"/>
                      </field>
                      <field name="value" type="com.acme.Foo"/>
                   </class>
                </bind-xml>
              

<Order reference="12343-AHSHE-314159">
        <Client>
                <Name>Jean Smith</Name>
                <Address>2000, Alameda de las Pulgas, San Mateo, CA 94403</Address>
        </Client>

        <Item reference="RF-0001">
                <Description>Stuffed Penguin</Description>
                <Quantity>10</Quantity>
                <UnitPrice>8.95</UnitPrice>
        </Item>

        <Item reference="RF-0034">
                <Description>Chocolate</Description>
                <Quantity>5</Quantity>
                <UnitPrice>28.50</UnitPrice>
        </Item>

        <Item reference="RF-3341">
                <Description>Cookie</Description>
                <Quantity>30</Quantity>
                <UnitPrice>0.85</UnitPrice>
        </Item>
</Order>
            

import java.util.Vector;
import java.util.Enumeration;

public class MyOrder {

    private String _ref;
    private ClientData _client;
    private Vector _items;
    private float _total;

    public void setReference(String ref) {
        _ref = ref;
    }

    public String getReference() {
        return _ref;
    }

    public void setClientData(ClientData client) {
        _client = client;
    }

    public ClientData getClientData() {
        return _client;
    }

    public void setItemsList(Vector items) {
        _items = items;
    }

    public Vector getItemsList() {
        return _items;
    }


    public void setTotal(float total) {
        _total = total;
    }

    public float getTotal() {
        return _total;
    }

    // Do some processing on the data
    public float getTotalPrice() {
        float total = 0.0f;

        for (Enumeration e = _items.elements() ; e.hasMoreElements() ;) {
            Item item = (Item) e.nextElement();
            total += item._quantity * item._unitPrice;
        }

        return total;
    }
}
            

public class ClientData {

    private String _name;
    private String _address;

    public void setName(String name) {
        _name = name;
    }

    public String getName() {
        return _name;
    }

    public void setAddress(String address) {
        _address = address;
    }

    public String getAddress() {
        return _address;
    }
}
            

public class Item {
    public String _reference;
    public int    _quantity;
    public float  _unitPrice;
    public String _description;
}
            

<?xml version="1.0"?>
<!DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Object Mapping DTD Version 1.0//EN"
                         "/mapping.dtd">

<mapping>
        <class name="MyOrder">
                <map-to xml="Order"/>

                <field name="Reference"
                       type="java.lang.String">
                        <bind-xml name="reference" node="attribute"/>
                </field>

                <field name="Total"
                       type="float">
                        <bind-xml name="total-price" node="attribute"/>
                </field>

                <field name="ClientData"
                       type="ClientData">
                        <bind-xml name="Client"/>
                </field>

                <field name="ItemsList"
                       type="Item"
                          collection="vector">
                        <bind-xml name="Item"/>
                </field>
        </class>

        <class name="ClientData">
                <field name="Name"
                       type="java.lang.String">
                        <bind-xml name="Name" node="element"/>
                </field>

                <field name="Address"
                       type="java.lang.String">
                        <bind-xml name="Address" node="element"/>
                </field>
        </class>

        <class name="Item">
                <field name="_reference"
                       type="java.lang.String"
                       direct="true">
                        <bind-xml name="reference" node="attribute"/>
                </field>

                <field name="_quantity"
                       type="integer"
                       direct="true">
                        <bind-xml name="Quantity" node="element"/>
                </field>

                <field name="_unitPrice"
                       type="float"
                       direct="true">
                        <bind-xml name="UnitPrice" node="element"/>
                </field>

                <field name="_description"
                       type="string"
                       direct="true">
                        <bind-xml name="Description" node="element"/>
                </field>
        </class>

</mapping>
            

import org.exolab.castor.mapping.Mapping;
import org.exolab.castor.mapping.MappingException;

import org.exolab.castor.xml.Unmarshaller;
import org.exolab.castor.xml.Marshaller;

import java.io.IOException;
import java.io.FileReader;
import java.io.OutputStreamWriter;

import org.xml.sax.InputSource;

public class main {

    public static void main(String args[]) {

        Mapping      mapping = new Mapping();

        try {
            // 1. Load the mapping information from the file
            mapping.loadMapping( "mapping.xml" );

            // 2. Unmarshal the data
            Unmarshaller unmar = new Unmarshaller(mapping);
            MyOrder order = (MyOrder)unmar.unmarshal(new InputSource(new FileReader("order.xml")));

            // 3. Do some processing on the data
            float total = order.getTotalPrice();
            System.out.println("Order total price = " + total);
            order.setTotal(total);

            // 4. marshal the data with the total price back and print the XML in the console
            Marshaller marshaller = new Marshaller(new OutputStreamWriter(System.out));
            marshaller.setMapping(mapping);
            marshaller.marshal(order);

        } catch (Exception e) {
            System.out.println(e);
            return;
        }
    }
}