"(2) Provide a developer who has requested a signal with respect to a particular user with a digital signal via a reasonably consistent real-time application programming interface that identifies, at a minimum, which of the following categories pertains to the user."
A Package Manager for OSTree: rpm-ostree
，更多细节参见91视频
Google 的 AppFunctions 也是同理。
图③：四川茂县南新镇安乡村村民在采摘苹果。
The most common task with streams is reading them to completion. Here's what that looks like with Web streams: