spring配置文件中引入context命名空间却不能使用context标签

<beans xmlns="http://www.springframework.org/schema/beans"     
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"           
    xmlns:context="http://www.springframework.org/schema/context"   
    xmlns:aop="http://www.springframework.org/schema/aop"       
    xmlns:tx="http://www.springframework.org/schema/tx"         
    xmlns:util="http://www.springframework.org/schema/util"         
    xmlns:p="http://www.springframework.org/schema/p"               
    xsi:schemaLocation="http://www.springframework.org/schema/beans                             
                        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd        
                        http://www.springframework.org/schema/context                           
                        http://www.springframework.org/schema/context/spring-context-3.0.xsd    
                        http://www.springframework.org/schema/aop                               
                        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
                        http://www.springframework.org/schema/tx                            
                        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd                      
                        http://www.springframework.org/schema/util                          
                        http://www.springframework.org/schema/util/spring-util-3.0.xsd">