# Package org.fourthline.cling.registry

- Interface Summary
  Interface | Description
  --- | ---
  Registry | The core of the UPnP stack, keeping track of known devices and resources.
  RegistryListener | Notification of discovered device additions, removals, updates.

- Class Summary
  Class | Description
  --- | ---
  DefaultRegistryListener | Convenience class, provides empty implementations of all methods.
  RegistryImpl | Default implementation of `Registry`.
  RegistryMaintainer | Runs periodically and calls `RegistryImpl.maintain()`.

- Exception Summary
  Exception | Description
  --- | ---
  RegistrationException | A recoverable error, thrown if device metadata could not be registered.

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