It's been more than a year since Apple since the previous model was released.

What if other teams are publishing to the trunk as well?

Stories above the line are in the release, and those below are not.

Or when users watch the trailer for an upcoming video game, they want to know when it will be released and where they can buy it.

As the researchers develop models for new classes of problems, they post them on a server, from which they can be downloaded.