@@ -336,76 +336,3 @@ To disable this behavior, use the ``string`` type:
336336
337337 This is not available for YAML and PHP, because they already have built-in
338338 support for the PHP keywords.
339-
340- Syntax for Referencing Services
341- -------------------------------
342-
343- You can of course also reference services, which looks a bit different in
344- each format. You can configure the behavior if the referenced service does
345- not exist. By default, an exception is thrown when a non-existent service
346- is referenced.
347-
348- YAML
349- ~~~~
350-
351- Start the string with ``@ `` or ``@? `` to reference a service in YAML.
352-
353- * ``@mailer `` references the ``mailer `` service. If the service does not
354- exist, an exception will be thrown;
355- * ``@?mailer `` references the ``mailer `` service. If the service does not
356- exist, it will be ignored;
357-
358- ..code-block ::yaml
359-
360- parameters :
361- # if 'my_mailer' service isn't defined, an exception will be raised
362- foo :@my_mailer
363-
364- # if 'my_logger' service isn't defined, 'bar' will be null
365- bar :@?my_logger
366-
367- tip ::
368-
369- Use ``@@ `` to escape the ``@ `` symbol in YAML. ``@@mailer `` will be
370- converted into the string ``"@mailer" `` instead of referencing the
371- ``mailer `` service.
372-
373- XML
374- ~~~
375-
376- In XML, use the ``service `` type. The behavior if the service does not exist
377- can be specified using the ``on-invalid `` argument. By default, an exception
378- is thrown. Valid values for ``on-invalid `` are ``null `` (uses ``null `` in place
379- of the missing service) or ``ignored `` (very similar, except if used on a
380- method call, the method call is removed).
381-
382- ..code-block ::xml
383-
384- <parameters >
385- <!-- if 'my_mailer' service isn't defined, an exception will be raised-->
386- <parameter key =" foo" type =" service" id =" my_mailer"
387-
388- <!-- if 'my_logger' service isn't defined, 'bar' will be null-->
389- <parameter key =" bar" type =" service" id =" my_logger" on-invalid =" null"
390- </parameters >
391-
392-
393- ~~~
394-
395- In PHP, you can use the
396- :class: `Symfony\\ Component\\ DependencyInjection\\ Reference ` class to reference
397- a service. The invalid behavior is configured using the second constructor
398- argument and constants from
399- :class: `Symfony\\ Component\\ DependencyInjection\\ ContainerInterface `.
400-
401- ..code-block ::php
402-
403- use Symfony\Component\DependencyInjection\Reference;
404-
405- // if 'my_mailer' service isn't defined, an exception will be raised
406- $container->setParameter('foo', new Reference('my_mailer'));
407-
408- // if 'my_logger' service isn't defined, 'bar' will be null
409- $container->setParameter('bar', new Reference('my_logger',
410- ContainerInterface::NULL_ON_INVALID_REFERENCE
411- ));