Adding background mode on Capabilities tabs

Question

I am using Xcode 6.3 and I just added bluetooth background mode on the capability tab:

Answer 1

If you change anything from Capabilities then you would see that your plist would get automatically updated based from Capabilities. They are both basically the same:

_{to see the text, click on the image to have it enlarged}

That which you see there is Xcode's convenience...telling you hey I wrote this in the plist for you