http://groups.google.com/group/symfony-devs/browse_thread/thread/3104c1a9e45799d2

routing.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="router.class">Symfony\Component\Routing\Router</parameter>
        <parameter key="routing.loader.class">Symfony\Bundle\FrameworkBundle\Routing\DelegatingLoader</parameter>
        <parameter key="routing.resolver.class">Symfony\Bundle\FrameworkBundle\Routing\LoaderResolver</parameter>
        <parameter key="routing.loader.xml.class">Symfony\Component\Routing\Loader\XmlFileLoader</parameter>
        <parameter key="routing.loader.yml.class">Symfony\Component\Routing\Loader\YamlFileLoader</parameter>
        <parameter key="routing.loader.php.class">Symfony\Component\Routing\Loader\PhpFileLoader</parameter>
        <parameter key="router.options.generator_class">Symfony\Component\Routing\Generator\UrlGenerator</parameter>
        <parameter key="router.options.generator_base_class">Symfony\Component\Routing\Generator\UrlGenerator</parameter>
        <parameter key="router.options.generator_dumper_class">Symfony\Component\Routing\Generator\Dumper\PhpGeneratorDumper</parameter>
        <parameter key="router.options.matcher_class">Symfony\Component\Routing\Matcher\UrlMatcher</parameter>
        <parameter key="router.options.matcher_base_class">Symfony\Component\Routing\Matcher\UrlMatcher</parameter>
        <parameter key="router.options.matcher_dumper_class">Symfony\Component\Routing\Matcher\Dumper\PhpMatcherDumper</parameter>
    </parameters>

    <services>
        <service id="routing.resolver" class="%routing.resolver.class%">
            <argument type="service" id="service_container" />
        </service>

        <service id="routing.loader.xml" class="%routing.loader.xml.class%">
            <tag name="routing.loader" type="xml" />
            <tag name="routing.loader.file" />
            <argument>%kernel.bundle_dirs%</argument>
        </service>

        <service id="routing.loader.yml" class="%routing.loader.yml.class%">
            <tag name="routing.loader" type="xml" />
            <tag name="routing.loader.file" />
            <argument>%kernel.bundle_dirs%</argument>
        </service>

        <service id="routing.loader.php" class="%routing.loader.php.class%">
            <tag name="routing.loader" type="php" />
            <tag name="routing.loader.file" />
            <argument>%kernel.bundle_dirs%</argument>
        </service>

        <service id="routing.loader.file" class="%routing.loader.class%">
            <tag name="routing.loader" type="file" />
            <argument type="service" id="controller_name_converter" />
            <argument type="service" id="logger" on-invalid="null" />
            <argument type="service" id="routing.resolver" />
        </service>

        <service id="routing.loader" class="Symfony\Bundle\FrameworkBundle\Routing\LazyLoader">
            <argument type="service" id="service_container" />
            <argument>routing.loader.real</argument>
        </service>

        <service id="router" class="%router.class%">
            <argument type="service" id="routing.loader" />
            <argument>%routing.resource%</argument>
            <argument type="collection">
                <argument key="cache_dir">%kernel.cache_dir%</argument>
                <argument key="debug">%kernel.debug%</argument>
                <argument key="generator_class">%router.options.generator_class%</argument>
                <argument key="generator_base_class">%router.options.generator_base_class%</argument>
                <argument key="generator_dumper_class">%router.options.generator_dumper_class%</argument>
                <argument key="generator_cache_class">%kernel.name%_%kernel.environment%UrlGenerator</argument>
                <argument key="matcher_class">%router.options.matcher_class%</argument>
                <argument key="matcher_base_class">%router.options.matcher_base_class%</argument>
                <argument key="matcher_dumper_class">%router.options.matcher_dumper_class%</argument>
                <argument key="matcher_cache_class">%kernel.name%UrlMatcher</argument>
            </argument>
        </service>
    </services>
</container>