generative protocol

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/protocols/Generative.mli b/lib/protocols/Generative.mli
new file mode 100644
index 0000000..14e2c13
--- /dev/null
+++ b/lib/protocols/Generative.mli
@@ -0,0 +1,24 @@
+type t
+
+(** values fixed for some of a relation's attributes, the attributes
+    absent from it being the ones left free. *)
+type binding = Concepts.Value.value BatMap.String.t
+
+class type implementation = object
+  method modes : (Concepts.Mode.t, Concepts.Condition.condition) result
+  method generate : binding -> (Handle.t, Concepts.Condition.condition) result
+end
+
+val make : #implementation -> Handle.protocol
+val from : Handle.t -> t Handle.interface option
+val require : Handle.t -> (t Handle.interface, Concepts.Condition.condition) result
+val modes : t Handle.interface -> (Concepts.Mode.t, Concepts.Condition.condition) result
+
+(** a handle carrying a cursor over the members agreeing with the
+    binding and under the empty binding this is enumeration, so a
+    relation carrying enumerable answers the same members here. *)
+val generate : t Handle.interface -> binding -> (Handle.t, Concepts.Condition.condition) result
+
+val nothing : binding
+val bound : binding -> Concepts.Mode.attributes
+val satisfies : binding -> Concepts.Tuple.t -> bool