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

<?xml version="1.0" ?>

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

    <parameters>
        <parameter key="form.field_factory.class">Symfony\Component\Form\FieldFactory\FieldFactory</parameter>
        <parameter key="form.field_factory.validator_guesser.class">Symfony\Component\Form\FieldFactory\ValidatorFieldFactoryGuesser</parameter>
        <parameter key="form.csrf_provider.class">Symfony\Component\Form\CsrfProvider\SessionCsrfProvider</parameter>
        <parameter key="form.theme.class">Symfony\Component\Form\Renderer\Theme\TwigTheme</parameter>
        <parameter key="form.theme.template">TwigBundle::form.html.twig</parameter>
        <parameter key="form.factory.class">Symfony\Component\Form\FormFactory</parameter>
        <parameter key="form.csrf_protection.enabled">true</parameter>
        <parameter key="form.csrf_protection.field_name">_token</parameter>
        <parameter key="form.csrf_protection.secret">secret</parameter>
        <parameter key="form.validation_groups">Default</parameter>
        <parameter key="file.temporary_storage.class">Symfony\Component\HttpFoundation\File\SessionBasedTemporaryStorage</parameter>
        <!-- TODO: configure through Configuration! -->
        <parameter key="file.temporary_storage.secret">abcdef</parameter>
        <parameter key="file.temporary_storage.nesting_levels">3</parameter>
        <parameter key="file.temporary_storage.directory"></parameter>
    </parameters>

    <services>

        <!-- FieldFactory -->
        <service id="form.field_factory" class="%form.field_factory.class%">
            <!-- All services with tag "form.field_factory.guesser" are inserted here by AddFieldFactoryGuessersPass -->
            <argument type="collection" />
        </service>

        <!-- ValidatorFieldFactoryGuesser -->
        <service id="form.field_factory.validator_guesser" class="%form.field_factory.validator_guesser.class%" public="false">
            <tag name="form.field_factory.guesser" />
            <argument type="service" id="validator.mapping.class_metadata_factory" />
        </service>
        
        <!-- CsrfProvider -->
        <service id="form.csrf_provider" class="%form.csrf_provider.class%">
            <argument type="service" id="session" />
            <argument>%form.csrf_protection.secret%</argument>
        </service>
        
        <!-- Theme -->
        <service id="form.theme" class="%form.theme.class%">
            <argument type="service" id="twig" />
            <argument>%form.theme.template%</argument>
        </service>
        
        <!-- TemporaryStorage - where should we put this? -->
        <service id="file.temporary_storage" class="%file.temporary_storage.class%">
            <argument type="service" id="session" />
            <argument>%file.temporary_storage.secret%</argument>
            <argument>%file.temporary_storage.nesting_levels%</argument>
            <argument>%file.temporary_storage.directory%</argument>
        </service>

        <!-- FormContext -->
        <service id="form.factory" class="%form.factory.class%">
            <argument type="service" id="form.theme" />
            <argument type="service" id="form.csrf_provider" />
            <argument type="service" id="validator" />
            <argument type="service" id="form.field_factory" />
            <argument type="service" id="file.temporary_storage" />
            <argument type="service" id="doctrine.orm.default_entity_manager" />
            <!--
            <argument key="validation_groups">%form.validation_groups%</argument>
            <argument key="csrf_protection">%form.csrf_protection.enabled%</argument>
            <argument key="csrf_field_name">%form.csrf_protection.field_name%</argument>
            -->
        </service>
        
    </services>
</container>