Just like any Symfony bundle, Zikula themes are allowed to utilize the DIC (Dependency Injection Container).
The DependencyInjection component of Symfony can be quite complex, but the initial implementation of it can be
done quite simply. Here, the extension file must be named
<Vendor><Name>Extension.php and simply
creates a loader and loads the
Description: The DependencyInjection component of Symfony can be quite complex. Several filetypes can be used (.yaml, .xml, etc). Please see the symfony documentation for further information.