The document discusses challenges around developer experience and regulatory compliance. It introduces bitemporal data which tracks both when information was true and when it was known to be true. This is important for regulatory compliance to avoid issues from not knowing these differences. Semantics are also discussed, which involve representing facts as subject-predicate-object triples to infer new facts not explicitly stored. MarkLogic 8 includes advances in semantics like improved performance, aggregates, updates, property paths and inference capabilities.