What it says on the tin.
|Invalid||Jhernandez||T89942 Provide open in app link on mobile site|
|Resolved||Fjalapeno||T87662 iOS app should support deeplinks (URL protocol to open app)|
Something like this that other apps can use to launch the app with specific content, e.g. wikipedia://en/Manchester
Basically this: http://blog.originate.com/blog/2014/04/22/deeplinking-in-ios/
I would recommend 'wikipedia-app:' URL schema taking an existing base URL, so something like:
but could do otherwise.
Consider also supporting the same scheme on Android. :)