private static String getString(PlanetilerConfig config, String key, String fallback) {
    return config.arguments()
      .getString("archive_" + key + "|mbtiles_" + key, "'" + key + "' attribute for tileset metadata", fallback);
  }
Metadata associated with a tile archive.
<p>
The default (de-)serialization corresponds to the
<a href="https://github.com/mapbox/mbtiles-spec/blob/master/1.3/spec.md#metadata">mbtiles spec</a>. As such each
value is a string.
planetiler-core/src/main/java/com/onthegomap/planetiler/archive/TileArchiveMetadata.java