Spring_在XML中通过切面引入新的功能

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:c="http://www.springframework.org/schema/c"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xmlns:jee="http://www.springframework.org/schema/jee"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/jdbc 
        http://www.springframework.org/schema/jdbc/spring-jdbc-4.3.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.3.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd">
        <bean id="audience" class="chapter4.practice1.Audience"/>
        <aop:config>
            <!-- 声明切面 -->
            <aop:aspect ref="audience">
                <!-- 定义切点 -->
                <aop:pointcut expression="executionexecution(** chapter4.practice1.Performance.perform(..))" 
　　　　　　　　　　id="performance"/>
                <!-- 定义前置通知 -->
                <aop:before pointcut-ref="performance" method="perform"/>
                <!-- 定义返回通知 -->
                <aop:after-returning pointcut-ref="performance" method="performReturn"/>
                <!-- 定义异常通知 -->
                <aop:after-throwing pointcut-ref="performance" method="performThrowing"/>
                <!-- 定义环绕通知 -->
                <aop:around pointcut-ref="performance" method="aroundPerformance"/>
                <!-- 定义一个存在参数的切点，为通知传参数 -->
                <aop:pointcut expression="executionexecution(** chapter4.practice1.Performance.play(String)) and 
　　　　　　　　　　args(gameName)" id="game"/>
                <!-- 为audience引入新的功能 -->
                <aop:declare-parents types-matching="chapter4.practice1.Audience+" 
　　　　　　　　　　implement-interface="chapter4.practice2.EnableFly" default-impl="chapter4.practice2.EnableFlyIntroducer"/>
            </aop:aspect>
        </aop:config>
            
</beans>