Table 1.
Metadata fields provided by Apple with relevance to our evaluation.
| Data fielda | Description |
| trackId | Numeric identifier of the app |
| trackName | App name |
| features | This is set to “iOSUniversal” if the app will work on all iOS-based devices independent of form factor |
| supportedDevices | List of possible devices on which the app runs |
| fileSizeBytes | File size in bytes |
| artistId | Numeric identifier for the manufacturer |
| sellerUrl | Link to a website provided by the manufacturer (if available) |
| price | Price of the app (numeric value without currency specification), example, 1.99 |
| currency | Currency for the “ price” field |
| genreIds | Numeric identifiers of the store categories assigned to the app |
| primaryGenreId | Numeric identifiers for the primary store category |
| minimumOsVersion | Minimum iOS version required |
| releaseDate | Date the app was first deployed; corresponds to field “currentVersionReleaseDate” for apps that have not yet been updated |
| currentVersionReleaseDate | Release date of the currently available, most recent app version |
| releaseNotes | Additional information provided by the manufacturer, if the app has been updated at least once |
| description | Full text of the store description |
| averageUserRating | The average star rating of all versions of an app (if sufficient numbers of ratings are available); may be empty |
| userRatingCount | The number of ratings of all versions of an app (if there are sufficient ratings); may be empty. |
aData fields with differing identifiers but identical content were merged.