Clarifying Spring context:property-placeholder local-override usage

I'm using a local override to specify a property and wanted to confirm that this just applies to properties that are specified in the applicationContext. Basically I want to make sure that this doesn't have any unexpected consequences...


<util:properties id="defaultProperties">
    <prop key="">${}</prop>

No properties except ${} will be overridden, yes?


No properties except ${} will be overridden with below code:

<context:property-placeholder  properties-ref="defaultProperties" location=", "ignore-resource-not-found="true" ignoreunresolvable="true" local-override="true"/> 

<bean id="defaultProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="properties">
    <util:properties local-override="true">
        <prop key="">${}</prop>

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