A request data store is a component that manages data that is
linked to the current request.
With the setRequestData() method you can link any object to the
current request. This object can be fetched via getRequestData()
as long as the request is running. This data is not available
in any sub-request (cocoon: protocol calls).
If you want to share data between the main request and any sub-request
than you have to use the setGlobalRequestData etc. methods.
This component is a replacement for the request lifecycle and
global request lifecycle components.