File: vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/form_csrf_under_form_sets_field_name.xml

<?xml version="1.0" ?>

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

    <framework:config>
        <framework:csrf-protection field-name="_custom" />
        <framework:form>
            <framework:csrf-protection field-name="_custom_form" />
        </framework:form>
        <framework:session />
    </framework:config>
</container>