Supported formats

Syntax flavour	constants	variables	rule	support
‘Standard’ datalog (like Prolog)	lowercase	uppercase	:-	getting there
Prolog	lowercase	uppercase	:-
Datalog with ? variables		start with ?	:-
Datomic		start with ?
LogiQL			<-

Examples

Syntax example adapted from MITRE datalog:

% facts
parent(john, douglas).
parent(bob, john).
parent(ebbon, bob).

% rules
ancestor(A, B) :-
  parent(A, B).

ancestor(A, B) :-
  parent(A, C),
  D = C,
  ancestor(D, B).

% query
ancestor(A, B)?