Every input in Streamx is associated with an
rule "First contact" when $currentFlight : FlightStatus() from entry-point "flight-control" ... end
By using the
from entry-point keyword, we specify that FligtStatus fact comes from “flight-control” entry point (input).
Note, that facts used for Amazon Kinesis data must be annotated with
@role(event). While facts used for DynamoDB data must not. See fact roles.