16. Search Engine Optimization (SEO)

Provide better window titles and metadata for search engines.

With the admin extension, you can start to edit the presentation documents SEO metadata. All other documents just have their display title used as window title.

Unless you ran composer on the last branch, you need a `composer.phar install`. You can manually create SEO information or reload the fixtures.
the `@var` is correct, see above.

about the constructor: that depends on the application. for the fixtures and for sonata admin, this works fine. the seo metadata admin extension creates the object for me. (i just tested this in the admin to be sure ;-) )

depending on what you do, it can make sense to initialize this in the constructor.