Make domain layer work with EventSourcing

[LeftTwixWand]

I'd like to use event sourcing for products quantity tracking.
Also, it would be good to have a projection with shows the product's popularity and graphic of sales.
But now it's a bit difficult to separate DomainEvents and EventSourcingEvents without making a confusion.

There are 2 possible solutions:

1. Make the DomainEvent -> DomainNotification
2. Create a domain service with stores events using event sourcing.