File: vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Tests/Fixtures/xml/services14.xml

<?xml version="1.0" encoding="utf-8"?>
<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="monolog.logger" parent="monolog.logger_prototype" public="false">
            <argument index="0">app</argument>
        </service>

        <service id="logger" alias="monolog.logger" />

        <service id="monolog.logger" parent="monolog.logger_prototype" public="false">
            <argument index="0">app</argument>
        </service>
        <service id="monolog.logger_prototype" class="Symfony\Bridge\Monolog\Logger" abstract="true">
            <argument /><!-- Channel -->
        </service>
    </services>
</container>