symfony/src/Symfony/Bundle/FrameworkBundle/Resources/config/form.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>
        <defaults public="false" />

        <!-- ResolvedFormTypeFactory -->
        <service id="form.resolved_type_factory" class="Symfony\Component\Form\ResolvedFormTypeFactory" />
        <service id="Symfony\Component\Form\ResolvedFormTypeFactoryInterface" alias="form.resolved_type_factory" />

        <!-- FormRegistry -->
        <service id="form.registry" class="Symfony\Component\Form\FormRegistry">
            <argument type="collection">
                <!--
                We don't need to be able to add more extensions.
                 * more types can be registered with the form.type tag
                 * more type extensions can be registered with the form.type_extension tag
                 * more type_guessers can be registered with the form.type_guesser tag
                -->
                <argument type="service" id="form.extension" />
            </argument>
            <argument type="service" id="form.resolved_type_factory" />
        </service>
        <service id="Symfony\Component\Form\FormRegistryInterface" alias="form.registry" />

        <!-- FormFactory -->
        <service id="form.factory" class="Symfony\Component\Form\FormFactory" public="true">
            <argument type="service" id="form.registry" />
            <argument type="service" id="form.resolved_type_factory" />
        </service>
        <service id="Symfony\Component\Form\FormFactoryInterface" alias="form.factory" />

        <!-- DependencyInjectionExtension -->
        <service id="form.extension" class="Symfony\Component\Form\Extension\DependencyInjection\DependencyInjectionExtension">
            <argument /><!-- All services with tag "form.type" are stored in a service locator by FormPass -->
            <argument type="collection" /><!-- All services with tag "form.type_extension" are stored here by FormPass -->
            <argument type="iterator" /><!-- All services with tag "form.type_guesser" are stored here by FormPass -->
        </service>

        <!-- ValidatorTypeGuesser -->
        <service id="form.type_guesser.validator" class="Symfony\Component\Form\Extension\Validator\ValidatorTypeGuesser">
            <tag name="form.type_guesser" />
            <argument type="service" id="validator.mapping.class_metadata_factory" />
        </service>

        <!-- CoreExtension -->
        <service id="form.property_accessor" alias="property_accessor" />

        <service id="form.choice_list_factory.default" class="Symfony\Component\Form\ChoiceList\Factory\DefaultChoiceListFactory" />

        <service id="form.choice_list_factory.property_access" class="Symfony\Component\Form\ChoiceList\Factory\PropertyAccessDecorator">
            <argument type="service" id="form.choice_list_factory.default"/>
            <argument type="service" id="form.property_accessor"/>
        </service>

        <service id="form.choice_list_factory.cached" class="Symfony\Component\Form\ChoiceList\Factory\CachingFactoryDecorator">
            <argument type="service" id="form.choice_list_factory.property_access"/>
        </service>

        <service id="form.choice_list_factory" alias="form.choice_list_factory.cached" />

        <service id="form.type.form" class="Symfony\Component\Form\Extension\Core\Type\FormType">
            <argument type="service" id="form.property_accessor" />
            <tag name="form.type" />
        </service>
        <service id="form.type.choice" class="Symfony\Component\Form\Extension\Core\Type\ChoiceType">
            <tag name="form.type" />
            <argument type="service" id="form.choice_list_factory"/>
        </service>

        <!-- FormTypeHttpFoundationExtension -->
        <service id="form.type_extension.form.http_foundation" class="Symfony\Component\Form\Extension\HttpFoundation\Type\FormTypeHttpFoundationExtension">
            <argument type="service" id="form.type_extension.form.request_handler" />
            <tag name="form.type_extension" extended-type="Symfony\Component\Form\Extension\Core\Type\FormType" />
        </service>

        <!-- HttpFoundationRequestHandler -->
        <service id="form.type_extension.form.request_handler" class="Symfony\Component\Form\Extension\HttpFoundation\HttpFoundationRequestHandler">
            <argument type="service" id="form.server_params" />
        </service>

        <service id="form.server_params" class="Symfony\Component\Form\Util\ServerParams">
            <argument type="service" id="request_stack" />
        </service>

        <!-- FormTypeValidatorExtension -->
        <service id="form.type_extension.form.validator" class="Symfony\Component\Form\Extension\Validator\Type\FormTypeValidatorExtension">
            <tag name="form.type_extension" extended-type="Symfony\Component\Form\Extension\Core\Type\FormType" />
            <argument type="service" id="validator" />
        </service>
        <service id="form.type_extension.repeated.validator" class="Symfony\Component\Form\Extension\Validator\Type\RepeatedTypeValidatorExtension">
            <tag name="form.type_extension" extended-type="Symfony\Component\Form\Extension\Core\Type\RepeatedType" />
        </service>
        <service id="form.type_extension.submit.validator" class="Symfony\Component\Form\Extension\Validator\Type\SubmitTypeValidatorExtension">
            <tag name="form.type_extension" extended-type="Symfony\Component\Form\Extension\Core\Type\SubmitType" />
        </service>
        <service id="form.type_extension.upload.validator" class="Symfony\Component\Form\Extension\Validator\Type\UploadValidatorExtension">
            <tag name="form.type_extension" extended-type="Symfony\Component\Form\Extension\Core\Type\FormType" />
            <argument type="service" id="translator"/>
            <argument type="string">%validator.translation_domain%</argument>
        </service>
    </services>
</container>