rework evaluators and add schema scope

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/kernel/Schema.mli b/lib/kernel/Schema.mli
new file mode 100644
index 0000000..7970ee2
--- /dev/null
+++ b/lib/kernel/Schema.mli
@@ -0,0 +1,23 @@
+(** A schema: its relations, \schema\[s]\relation\[r]. For now only a
+    namespace for them. *)
+module Make (S : Abstract.Storage.STORAGE) : sig
+  include Merkle.VALUE
+
+  val load :
+    ?bind:EphemeralRelation.binding ->
+    S.connection ->
+    t ->
+    (Protocols.Handle.t, Concepts.Condition.condition) result
+
+  (** a schema handed over with no address, as a directory holding its
+      relations under \relation, to store once the write has begun. A
+      relation with no address is stored as a program if it is one, and
+      as the tuples it holds if not. *)
+  val admit :
+    string ->
+    Protocols.Handle.t ->
+    (S.transaction Prototype.Associative.admission, Concepts.Condition.condition) result
+
+  (** an empty one, stored. *)
+  val make : S.connection -> (Protocols.Handle.t, Concepts.Condition.condition) result
+end