<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="de.laliluna.example">
  <class name="book" table="book">
    <composite-id>
       <key-property name="id" />
       <key-many-to-one name="customer" column="customer_fk" class="customer" />
    </composite-id>
    <property name="title" column="title" type="java.lang.String" />
    <property name="author" column="author" type="java.lang.String" />
    <property name="available" column="available"/>

  </class>
  <class name="customer" table="customer">       
    <id name="id">           
      <generator class="increment"/>       
    </id>               
    <bag name="books" inverse="false">       
      <key column="customer_fk" />       
      <one-to-many class="book"/>       
    </bag>
    <property name="name" column="name"/>       
    <property name="lastname" column="lastname"/>       
    <property name="age" column="age" />   
    </class>   
</hibernate-mapping>