<bean class="org.codehaus.xfire.spring.ServiceBean">
  <property name="serviceBean">
  <ref bean="CustomerServiceA"/>
  </property>
  <property name="serviceClass"
  value="crmwsi.crm.CustomerServiceA" />
  <property name="name" value="CustomerServiceA" />
  <property name="inHandlers">
  <list>
  <ref bean="addressingHandler" />
  </list>
  </property>
  </bean>
配置的属性property ,serviceBean和serviceClass,哪个是接口,哪个是实现类?