File: vendor/doctrine/doctrine-cache-bundle/Tests/DependencyInjection/Fixtures/config/xml/aliased.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>
        <alias key="foo">foo_namespace_provider</alias>

        <provider name="foo_namespace_provider" type="array">
            <alias>fooNamespaceProvider</alias>
        </provider>

        <provider name="barNamespaceProvider" type="array">
            <alias>bar_namespace_provider</alias>
            <alias>bar</alias>
        </provider>
    </doctrine-cache>
</srv:container>