that's specific to the ``AcmeBlogBundle``. Since the middle, "controller",

portion is missing (e.g. ``Blog``), the template lives at

``Resources/views/layout.html.twig`` inside ``AcmeBlogBundle``.

Note thatthecolon is not removed with the "controller", and two colons exist

between the "bundle"name and template file name.

Yes, there are 2 colons inthemiddle of the string when the "controller"

subdirectory part is missing.

* ``::base.html.twig``: This syntax refers to an application-wide base template

or layout. Notice that the string begins with two colons (``::``), meaning