The ``Configuration`` class can be much more complicated than shown here,

supporting array nodes, "prototype" nodes, advanced validation, XML-specific

normalization and advanced merging. You can read more about this in:doc:`the Config Component documentation</components/config/definition>`.

You can also see it action by checking out some of the core Configuration classes,

You can also see itinaction by checking out some of the core Configuration classes,

such as the one from the `FrameworkBundle Configuration`_ or the `TwigBundle Configuration`_.

..index::