Spring Boot中Dubbo的XML和YAML配置有何区别，导致启动失败？

server:
  port: 8083
dubbo:
  application:
    name: dubbo-provider
  registry:
    address: zookeeper://localhost:2181
  protocol:
    name: dubbo
    port: -1

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
       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.xsd
       http://dubbo.apache.org/schema/dubbo
       http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
    <application name="dubbo-provider"/>
    <registry address="zookeeper://127.0.0.1:2181"/>
    <protocol name="dubbo" port="-1"/>
    <service interface="cn.suiwei.service.TimeService" ref="timeServiceImpl"/>
    <bean class="cn.suiwei.provider.service.TimeServiceImpl" id="timeServiceImpl"/>
</beans>