/// An instance of `MapCacheConfig`

var config: MapCacheConfig { get set }

/// The implementation shall convert a tile path into a URL object

///

/// Typically it will use the `config.urlTemplate` and `config.subdomains`.

///

/// An example of implementation can be found in the class`MapCache`

func url(forTilePath path: MKTileOverlayPath) -> URL

///

/// The implementation shall return either the tile as a Data object or an Error if the tile could not be retrieved.

///

/// - SeeAlso [MapKit.MkTileOverlay](https://developer.apple.com/documentation/mapkit/mktileoverlay)

func loadTile(at path: MKTileOverlayPath, result: @escaping (Data?, Error?) -> Void)