xml的说明行不能除去

在springmvc中 要写控制器的xml

前面两行是

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

去掉第二行后出现异常如下

org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 4 in XML document from ServletContext resource [/WEB-INF/springmvc-servlet.xml] is invalid; nested exception is org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'beans'.

看来是不能除去的