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# betty.extension.deriver package

## Module contents

Expand an ancestry by deriving additional data from existing data.

final class betty.extension.deriver.Deriver

  Bases: `Extension`

  Expand an ancestry by deriving additional data from existing data.

  classmethod comes_before() → set[MachineName]

    The extensions that this one comes before.

    The other extensions may or may not be enabled.

  classmethod plugin_description() → Localizable

    Get the human-readable long plugin description.

  classmethod plugin_id() → MachineName

    Get the plugin ID.

    IDs are unique per plugin type:

    - A plugin repository MUST at most have a single plugin for any ID.

    - Different plugin repositories MAY each have a plugin with the same ID.

  classmethod plugin_label() → Localizable

    Get the human-readable short plugin label.

  register_event_handlers(registry: EventHandlerRegistry) → None

    Register event handlers with the project.