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A comment on The Essence of Datalog (2018).

Re:The Essence of Datalog (2018) by muydeemer on Sunday March 10, 2019 @02:33PM (#19353456)
As I see people mentioning Datalog-related software, I'm gonna throw a pebble into the yard as well - Graql (https://github.com/graknlabs/grakn) is a declarative graph-based query language with rule-based reasoning heavily inspired by Datalog and Logic Programming.

Disclaimer: I am one of the maintainers.

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Re:The Essence of Datalog (2018) by muydeemer on Sunday March 10, 2019 @07:41PM (#19355505)
Just to add and clarify: it supports recursion (since a couple releases back) and pattern negation based on set difference (on current master branch, soon to be released).
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