DTD-style vs Xml Schem-style in Spring 2.5

http://static.springsource.org/spring/docs/2.5.x/reference/xsd-config.html

DTD-style

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
    "http://www.springframework.org/dtd/spring-beans-2.0.dtd">

<beans>

<!-- <bean/> definitions here -->

</beans>

XML Schema-style

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<!-- <bean/> definitions here -->

</beans>