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+open Sexplib.Std
+
+type cardinality_spec =
+ | Finite of int
+ | AlephZero
+ | Continuum
+ | ConstrainedFinite
+[@@deriving sexp]
+
+type statement =
+ | CreateDatabase of string
+ | CreateRelation of { name: string; schema: (string * string) list }
+ | RetractRelation of string
+ | ClearRelation of string
+ | RegisterDomain of { name: string; cardinality: cardinality_spec }
+[@@deriving sexp]