The most important thing that datomic and friends brought, is usability and pragmatism. While RDF has an elegant core, it is bogged down by the complixity of t

The most important thing that datomic and friends brought, is usability and pragmatism. While RDF has an elegant core, it is bogged down by the complixity of the web and ancillary technologies. XML Types, cURIes, OWL, the different encodings. They all make RDF a nightmare to work with, and to implement in practice. The is simply no good RDF software ecosystem, yet the Spec ecosystem continues to grow (wildly out of control). On a technical note, SPARQL and Datomic Datalog are very different beasts. The former is conjunctive queries with optionals and regular path expressions (i.e. Conjunctive queries + XPath + nonmonotonic defaults) while the latter is recursive conjunctive queries (i.e. Datalog).