symfony/src/Symfony/Component/DependencyInjection/Tests/Fixtures/xml/services_abstract.xml

<?xml version="1.0" encoding="utf-8"?>
<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>
    <service id="service_container" class="Symfony\Component\DependencyInjection\ContainerInterface" public="true" synthetic="true"/>
    <service id="foo" class="Foo" public="true" abstract="true"/>
    <service id="Psr\Container\ContainerInterface" alias="service_container" public="false"/>
    <service id="Symfony\Component\DependencyInjection\ContainerInterface" alias="service_container" public="false"/>
  </services>
</container>