symfony/src/Symfony/Bundle/FrameworkBundle/Resources/config/property_info.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>
        <service id="property_info" class="Symfony\Component\PropertyInfo\PropertyInfoExtractor" >
            <argument type="collection" />
            <argument type="collection" />
            <argument type="collection" />
            <argument type="collection" />
        </service>
        <service id="Symfony\Component\PropertyInfo\PropertyInfoExtractorInterface" alias="property_info" public="false" />

        <!-- Extractor -->
        <service id="property_info.reflection_extractor" class="Symfony\Component\PropertyInfo\Extractor\ReflectionExtractor" public="false">
            <tag name="property_info.list_extractor" priority="-1000" />
            <tag name="property_info.type_extractor" priority="-1002" />
            <tag name="property_info.access_extractor" priority="-1000" />
        </service>
    </services>
</container>