classDiagram
    class BaseVersionableItem {
        +concrete: bool
        +content_model: type[models.Model]
        +content_admin_mixin: type | None
        +__init__(content_model: type[models.Model], content_admin_mixin: type | None = None)
    }
    class VersionableItem {
        +grouper_field_name: str
        +copy_function: callable
        +extra_grouping_fields: Iterable[str] | None
        +version_list_filter_lookups: dict[str, Any] | None
        +grouper_admin_mixin: type | None
        +content_admin_mixin: type | None
        +preview_url
        +__init__(content_model: type[models.Model], grouper_field_name: str, copy_function: callable, extra_grouping_fields: Iterable[str] | None = None, version_list_filter_lookups: dict[str, Any] | None = None, grouper_admin_mixin: type | None = None, content_admin_mixin: type | None = None, preview_url = None)
        +grouper_choices_queryset() models.QuerySet
        +get_grouper_with_fallbacks(grouper_id) models.Model | None
        +_get_content_types() set[int]
    }
    class VersionableItemAlias {
        +to: BaseVersionableItem
        +__init__(content_model: type[models.Model], to: BaseVersionableItem, content_admin_mixin: type | None = None)
    }
    BaseVersionableItem <|-- VersionableItem
    BaseVersionableItem <|-- VersionableItemAlias

    class VersioningPageToolbar {
        +page_content: PageContent | None
        +__init__(*args, **kwargs)
        +get_page_content(language: str | None = None) PageContent
    }

    class Admin {
        +get_versioning_state(obj: models.Model) str | None
        +get_author(obj: models.Model) str | None
        +get_modified_date(obj: models.Model) str | None
    }

    class Helpers {
        +replace_admin_for_models(pairs: tuple[type[models.Model], type], admin_site: admin.AdminSite | None = None)
        +register_versionadmin_proxy(versionable, admin_site: admin.AdminSite | None = None)
        +get_preview_url(content_obj: models.Model, language: str | None = None) str
    }

    class Conditions {
        +__add__(other: list) Conditions
        +__get__(instance: object, cls) Conditions | BoundConditions
    }

    class Emails {
        +get_full_url(location: str, site: Site | None = None) str
    }

    class Indicators {
        +content_indicator(content_obj: models.Model, versions: list[Version] | None = None) str | None
    }