双向一对一外键关联xml配置

Student.hbm.xml

<?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="com.hibernate.demo.po">
    <class name="Student">
       <id name="id">
       		<generator class="native"/>
       </id>
       <property name="name"/>
       <one-to-one name="stuIdCard" property-ref="student"></one-to-one>
    </class>
</hibernate-mapping>