Canonical URL for the item in an external system.
Optionaltags?: NewTagsTags to change on the activity. Use an empty array of NewActor to remove a tag. Use twistTags to add/remove the twist from tags to avoid clearing other actors' tags.
OptionaltwistTags?: Partial<Record<Tag, boolean>>Add or remove the twist's tags. Maps tag ID to boolean: true = add tag, false = remove tag. This is allowed on all activities the twist has access to.
Unique identifier for the activity.