3 files changed, 4 insertions, 4 deletions
diff --git a/lib/protocols/Context.ml b/lib/protocols/Context.ml
new file mode 100644
index 0000000..b7c8a37
--- /dev/null
+++ b/lib/protocols/Context.ml
@@ -0,0 +1,4 @@
+type t =
+  { snapshot : Concepts.Hash.hash
+  ; root : Handle.t
+  ; status : unit -> [`Live | `Cancelled | `Exhausted] }
diff --git a/lib/protocols/Relation.ml b/lib/protocols/Relation.ml
index 54454cf..c05337f 100644
--- a/lib/protocols/Relation.ml
+++ b/lib/protocols/Relation.ml
@@ -7,7 +7,6 @@ module Error = struct
 end
 
 class type implementation = object
-  method heading : (Concepts.Hash.hash, Concepts.Condition.condition) result
   method predicate : (Concepts.Hash.hash option, Concepts.Condition.condition) result
   method local_constraints : (Concepts.Hash.hash option, Concepts.Condition.condition) result
   method contains : Concepts.Tuple.t -> (bool, Concepts.Condition.condition) result
@@ -19,7 +18,6 @@ type t = implementation
 let make impl = Relation (impl :> implementation)
 let from handle = Handle.into handle (function Relation impl -> Some impl | _ -> None)
 let require handle = from handle |> Option.to_result ~none:(Error.not_a_relation ())
-let heading i = Handle.invoke i (fun o -> o#heading)
 let predicate i = Handle.invoke i (fun o -> o#predicate)
 let local_constraints i = Handle.invoke i (fun o -> o#local_constraints)
 let contains i tuple = Handle.invoke i (fun o -> o#contains tuple)
diff --git a/lib/protocols/Relation.mli b/lib/protocols/Relation.mli
index 7e64a3b..384877e 100644
--- a/lib/protocols/Relation.mli
+++ b/lib/protocols/Relation.mli
@@ -1,7 +1,6 @@
 type t
 
 class type implementation = object
-  method heading : (Concepts.Hash.hash, Concepts.Condition.condition) result
   method predicate : (Concepts.Hash.hash option, Concepts.Condition.condition) result
   method local_constraints : (Concepts.Hash.hash option, Concepts.Condition.condition) result
   method contains : Concepts.Tuple.t -> (bool, Concepts.Condition.condition) result
@@ -10,7 +9,6 @@ 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 heading : t Handle.interface -> (Concepts.Hash.hash, Concepts.Condition.condition) result
 
 val predicate :
   t Handle.interface -> (Concepts.Hash.hash option, Concepts.Condition.condition) result