1 files changed, 9 insertions, 0 deletions
diff --git a/lib/domain.ml b/lib/domain.ml
new file mode 100644
index 0000000..753a7b9
--- /dev/null
+++ b/lib/domain.ml
@@ -0,0 +1,9 @@
+type t = {
+  name : Conventions.Name.t;
+  generator : Generator.t;
+  membership_criteria : Tuple.t -> bool;
+  cardinality : Conventions.Cardinality.t;
+}
+
+let make ~name ~generator ~membership_criteria ~cardinality =
+  { name; generator; membership_criteria; cardinality }