Thanks for your feedback! Very good point on the naming. fwiw the idea was if you buy a cinema ticket, you are usually presented with some sort of seating plan and select the seat (basically putting them into the shopping cart). So SeatSelected would be the equivalent of "ItemAdded" to the shopping cart in an e-commerce application I guess.
Please don't over-interpret the example. There isn't even a definition what that booking aggregate contains. The point was really only to say that in order to differentiate the events, we don't necessarily need distinct types (which would result in multiple schemas on a topic), but can instead encode it in one type/schema. Think of it like mapping in ORM - instead of "table per subclass", you can use "table per class hierarchy".
