File: vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Resources/config/property_access.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">

    <parameters>
        <parameter key="property_accessor.class">Symfony\Component\PropertyAccess\PropertyAccessor</parameter>
    </parameters>

    <services>
        <service id="property_accessor" class="%property_accessor.class%" >
            <argument /> <!-- magicCall, set by the extension -->
            <argument /> <!-- throwExceptionOnInvalidIndex, set by the extension -->
        </service>
    </services>
</container>