File: vendor/doctrine/doctrine-cache-bundle/Tests/Functional/Fixtures/config/chain.xml

<?xml version="1.0" ?>
<srv:container xmlns="http://doctrine-project.org/schemas/symfony-dic/cache"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xmlns:srv="http://symfony.com/schema/dic/services"
               xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
                        http://doctrine-project.org/schemas/symfony-dic/cache http://doctrine-project.org/schemas/symfony-dic/cache/doctrine_cache-1.0.xsd">

    <doctrine-cache>
        <provider name="my_array_cache" type="array" />

        <provider name="my_second_array_cache" type="array" />

        <provider name="my_chain_cache">
            <chain>
          	    <provider>my_array_cache</provider>
          	    <provider>my_second_array_cache</provider>
            </chain>
        </provider>
    </doctrine-cache>
</srv:container>