关于hibernate新特性dynamic-class

Question

今天突然想到dynamic-class 写了断测试结果<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- dtd -->
<hibernate-mapping package="com.weportal.dynamicclass"> <dynamic-class entity-name="Country">
<id name="id" type="long">
<generator class="hilo" />
</id>
<property name="name" column="name" type="string" />
</dynamic-class>

</hibernate-mapping>为什么hibernate-mapping老是报错,为什么??????