public interface IMansionContext { Resident GetResident(string id); Room GetRoom(string id); Furniture GetFurniture(string id); void AddResident(Resident resident); void AddRoom(Room room); void AddFurniture(Furniture furniture); void RemoveResident(string id); void RemoveRoom(string id); void RemoveFurniture(string id); }This interface defines methods for getting, adding, and removing residents, rooms, and furniture. The methods take a string id parameter to identify the specific object to retrieve or modify. The package library that contains IMansionContext is likely a custom library developed for a specific project that involves managing a virtual mansion.