问如何正确定位Spring上下文属性占位符？

EN

<mule 
    xmlns="http://www.mulesoft.org/schema/mule/core" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:spring="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:zuul="zuul-spring-client-1.5.1"
    xsi:schemaLocation="
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
zuul-spring-client-1.5.1 zuul-spring-client-1.5.1.xsd">


        <context:property-placeholder properties-ref="MuleMeetZuul" />
    
</mule>

Caused by: org.mule.runtime.api.exception.MuleRuntimeException: There was '1' error while parsing the given file 'zuultest.xml'.
Full list:
org.xml.sax.SAXParseException; lineNumber: 17; columnNumber: 65; cvc-complex-type.2.4.a: Invalid content was found starting with element 'context:property-placeholder'. One of '{"http://www.mulesoft.org/schema/mule/core":annotations, "http://www.mulesoft.org/schema/mule/core":description, "http://www.mulesoft.org/schema/mule/core":global-property, "http://www.mulesoft.org/schema/mule/core":configuration, "http://www.mulesoft.org/schema/mule/core":notifications, "http://www.mulesoft.org/schema/mule/core":abstract-extension, "http://www.mulesoft.org/schema/mule/core":abstract-shared-extension, "http://www.mulesoft.org/schema/mule/core":abstract-mixed-content-extension, "http://www.mulesoft.org/schema/mule/core":abstract-security-manager, "http://www.mulesoft.org/schema/mule/core":abstract-transaction-manager, "http://www.mulesoft.org/schema/mule/core":abstract-shared-transaction-manager, "http://www.mulesoft.org/schema/mule/core":abstract-connector, "http://www.mulesoft.org/schema/mule/core":abstract-shared-connector, "http://www.mulesoft.org/schema/mule/core":abstract-global-endpoint, "http://www.mulesoft.org/schema/mule/core":abstract-exception-strategy, "http://www.mulesoft.org/schema/mule/core":abstract-on-error, "http://www.mulesoft.org/schema/mule/core":abstract-flow-construct, "http://www.mulesoft.org/schema/mule/core":flow, "http://www.mulesoft.org/schema/mule/core":sub-flow, "http://www.mulesoft.org/schema/mule/core":top-level-processor, "http://www.mulesoft.org/schema/mule/core":abstract-global-intercepting-message-processor, "http://www.mulesoft.org/schema/mule/core":abstract-object-store}' is expected.