services_with_array_tags.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 https://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="Bar\FooClass">
      <tag name="foo_tag">
        <attribute name="name">attributeName</attribute>
        <attribute name="foo">bar</attribute>
        <attribute name="bar">
          <attribute name="foo">bar</attribute>
          <attribute name="bar">foo</attribute>
        </attribute>
      </tag>
    </service>
  </services>
</container>