How is data shared between Web Dynpro controllers?

The correct answer highlights the functionality of context mapping within the Web Dynpro framework. Data is shared between controllers, specifically from a view controller to the component controller, through context mapping.

In Web Dynpro, controllers manage the data context that represents the application's state and structure. The view controller typically holds data relevant to a particular view, while the component controller is responsible for the overall data management of the entire component. By utilizing context mapping from the view controller to the component controller, developers can effectively synchronize data and ensure that changes in the view context are reflected at the component level. This allows for a cohesive and structured sharing of data across various components of the application, ensuring that all relevant state information is well managed and accessible.

The context mapping approach between different types of controllers is specific in how it limits the data flow direction, emphasizing the importance of maintaining data integrity and proper hierarchy within the application's architecture. This structured sharing mechanism is key for maintaining the separation of concerns in a Web Dynpro application.