> The Events here give up on the naming, granularity, and semantics problem: they're extremely low level fine-grained changes to fields in a database. You say

> The Events here give up on the naming, granularity, and semantics problem: they're extremely low level fine-grained changes to fields in a database. You say "fields", I say "facts". Which of a set of nominal events or a graph of facts is higher-level will ultimately depend on the domain, but using Datomic over several years now has led me to think that it's much more often the latter than conventional Event Sourcing has trained us to believe. In fact, it may well be that Event Sourcing has traditionally been relegated to those (few) use cases where the "set of nominal Event Types" approach is better, being the only situations where conventional Event Sourcing is practical. > Events themselves are no longer interesting or semantically meaningful, because they're a single atomic change to a database field. A change in the way state is represented means a different set of events is produced. Subscribing to meaningful occurrences in this model is difficult, Datoms are not 'single' or 'atomic' - they're packed coherently together in a Transaction, and are immediately relatable to entire database values. Subscribing is just pattern matching, and is not hard, as the following section of the article tried to show: https://vvvvalvalval.github.io/posts/2018-11-12-datomic-event-sourcing-without-the-hassle.html#processing_events_with_datomic https://vvvvalvalval.github.io/posts/2018-11-12-datomic-even.... > [...] and probably will eventually result in the creation of a "meta-event" for each action that contains the semantic intent of the outcome. Which would only bring you back to the 'set of nominal Events' case, so it's not a regression compared to conventional Event Sourcing anyway. That's what the article meant by 'annotating Reified Transactions', and that's something you can even do after the fact (i.e in a later transaction, when the requirement for it becomes apparent) which means that you don't have to get these aspects rights upfront, nor commit to them. For a more in-depth discussion of Datomic's Reified Transactions, I suggest this talk by Tim Ewald: https://docs.datomic.com/on-prem/videos.html#reified-transactions https://docs.datomic.com/on-prem/videos.html#reified-transac...