How to create alias in XML markup?

Question

symfony

<service id="League\Tactician\CommandBus"
        >
            <argument key="$middleware">
                <argument type="service"
                          id="tactician.commandbus.default"
                />
            </argument>
        </service>

//or

     <service id="League\Tactician\CommandBus"
        >
            <argument key="$middleware"
                      type="service"
                      id="tactician.commandbus.default"
            />
        </service>

Give an error

Type error: Argument 1 passed to League\Tactician\CommandBus::__construct() must be of the type 
array, string given, called in /home/vagrant/Code/symfony-simple-
adminka/var/cache/dev/ContainerFKJa0xU/getLogInControllerService.php on line 16

In .yaml markup, this is how it worked

League\Tactician\CommandBus: '@tactician.commandbus.default'

Answer 1

<service id="League\Tactician\CommandBus" alias="tactician.commandbus.default"/>