<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
     <bean id="triangle" class="bean.Trinangle">
         <property name="points">
             <list>
                 <ref bean="point1"/>
                 <ref bean="point2"/>
                 <ref bean="point3"/>
             </list>
         </property>
     </bean>
     <bean id= "point1" class="bean.Point">
         <property name="x" value="10"/>
         <property name="y" value="20"/>
     </bean>
     <bean id= "point2" class="bean.Point">
         <property name="x" value="10"/>
         <property name="y" value="20"/>
     </bean>
     <bean id= "point3" class="bean.Point">
         <property name="x" value="10"/>
         <property name="y" value="20"/>
     </bean>
</beans>              
Question: this is my XML file.on the 6 th line im getting error"he content of element type "property" must match "(description?,meta*,(bean|ref|idref|value|null|list|set|map| props)?)".".