The Xmf\Key\KeyAbstract is an abstract class that defines a Key.
The concrete implementations of KeyAbstract are responsible for
creating keys
serializing and deserializing key data for storage
interacting with a StorageInterface implementation for key persistence as needed
__construct($storage, $name)
The StorageInterface instance, $storage, handles persistence for this key. The $name parameter is the symbolic name of the key to use. The $name uniquely identifies the key in the key store. The key name should relate to a specific application action, or a closely related set of actions.