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.factory.class">Symfony\Component\Form\FormFactory</parameter>
        <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.default_context.class">Symfony\Component\Form\FormContext</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>
    </parameters>

    <services>
    
    	<!-- FormFactory -->
        <service id="form.factory" class="%form.factory.class%">
            <argument type="service" id="form.default_context" />
        </service>

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

    	<!-- FormContext -->
        <service id="form.default_context" class="%form.default_context.class%">
            <argument type="service" id="service_container" />
            <call method="validator">
                <argument type="service" id="validator" />
            </call>
            <call method="validationGroups">
                <argument>%form.validation_groups%</argument>
            </call>
            <call method="fieldFactory">
                <argument type="service" id="form.field_factory" />
            </call>
            <call method="csrfProtection">
                <argument>%form.csrf_protection.enabled%</argument>
            </call>
            <call method="csrfFieldName">
                <argument>%form.csrf_protection.field_name%</argument>
            </call>
            <call method="csrfProvider">
                <argument type="service" id="form.csrf_provider" />
            </call>
        </service>
        
    </services>
</container>