There are painters who transform the sun to a yellow spot, but there are others who with the help of their art and their intelligence transform a yellow spot into the sun.
We now return to the examination of event processing networks that we started in chapter 6, to take a deeper look at the event processing agents (EPAs) that an event processing network can contain. The most important kinds of EPAs are Filter, Transformation, and Pattern detect. In this chapter we look at the first two of these. Pattern detection is a large topic, so we dedicate the entire next chapter to that. We also look at the general question of how context is applied to EPAs of all kinds.
In this chapter we will ...