Description of the process handling of App Backend
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Apps created in Altinn Studio have a seperate Process API that exposes functionality to clients to controll the process.
The process service is where the business logic for BPMN processing is located. It is responsible for verifying state, and changes of state
BPMN reader is the component that parses BPMN process in apps.
When app process changes state app logic is run making it possible for app developers to implements specific app logic.
See AppBase.cs and IAltinnApp.