Imagine you want to wait for events B(key=value) and C(key=value) all caused by common cause A as a single atomic event. You can have a descriptor that represe

Imagine you want to wait for events B(key=value) and C(key=value) all caused by common cause A as a single atomic event. You can have a descriptor that represents the combination of all that state. https://en.wikipedia.org/wiki/Complex_event_processing https://en.wikipedia.org/wiki/Complex_event_processing I think it would be helpful for microservices and graphical user interfaces for complicated user behaviour.