- raw event processing: operations on events that do not change the events - just filter and route them.
- transformed event processing: aggregation and enrichment - this is a type of processing that transform the event. Examples: enrichment it is transformed by adding attributes taken from an external store (e.g. database), translation - create an event with different format / contain translated attributes...
- Pattern-based event processing -- detecting pattern - and derive events based on the events that participate in the detected pattern.
As said, this is just one of the classifications. More discussions about other classifications - later.