Created question in FIWARE Q/A platform on 08-09-2015 at 14:09
Please, ANSWER this question AT http://stackoverflow.com/questions/32457977/assigning-values-between-events

Question:
Assigning values between events

Description:
We have a question concerning the assignment of values between events in Fiware CEP.

Suppose that, based on two triggered events, a third event is initiated. So let’s assume they are called event A, B and C. If A and B are triggered, C should be triggered, assuming that the conditions in EPA are met.

From the log files we can determine that event A and B are being triggered, but event C is triggered but empty. We are so far unable to assign values from event A and B to event C. Our goal is to provide event C with details (a summation of two integers from event A and B) from the events it is triggered by.

Could you provide us with some information into how we can assign values from one event to a new event. Is it possible to use 2 events as input values for a new event? We have tried to assign values to event C by providing them with default values (i.e. by referring to A.variable_1). Also we have tried to assign new event attributes in the EPA -> derivation -> event attributes.

In our Proactive authoring tool we cannot find the solution to our problem. We know the mathematical functions, as described in the user guide, but we failed to deduce how to assign a value from a mathematical function from one event to a new event.