Discuss streamed named graph

[keski]

In 3.3.2 Immutability and Event Derivation we state that a new unique graph should be generated for each derived event, which could then link back to other events.
In my understanding this means that events would be referenced by their named graphs (?). When I read the document this made me a bit confused since there is no indication that the named graph structure used for anything other than transporting a set of triples from A to B. All examples seem to assume that: 1) no named graphs are being streamed only triples, or 2) the named graph structure is lost and all triples are added to the default graph of the window upon arrival.
If 2) will we be able to use RSP-QL for CEP? Perhaps this is out of scope for this document but if possible it would be nice if we could we bit clearer about this.