我的xsd有问题吗？出错了，是不是我少了什么东西

 schema_reference.4: Failed to read schema document 'http://www/springframework.org/schema/aop/spring-aop.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

<?xml version="1.0" encoding="UTF-8"?>

<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"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www/springframework.org/schema/aop

        http://www/springframework.org/schema/aop/spring-aop.xsd">

        <bean id="myAspect" class="com.spring.aop.schema.advice.MyAspect"></bean>

        <bean id="aspectBiz" class="com.spring.aop.schema.advice.biz.AspectBiz"></bean>

        <aop:config>

            <aop:aspect id="myAspectAOP" ref="myAspect">

                 <aop:pointcut id="myPointcut" 

                 expression="execution(* com.spring.aop.schema.advice.biz.*Biz.*(..))"/>

                 <aop:before method="before" pointcut-ref="myPointcut"/>

            </aop:aspect>   

        </aop:config>

</beans>