relational-query: add a module for sequence structure.

relational-query/relational-query.cabal

@@ -62,6 +62,7 @@ library
                        Database.Relational.Monad.Register
                        Database.Relational.Relation
                        Database.Relational.Set
+                       Database.Relational.Sequence
                        Database.Relational.Effect
                        Database.Relational.Scalar
                        Database.Relational.Type

relational-query/src/Database/Relational.hs

@@ -35,6 +35,7 @@ module Database.Relational (
   module Database.Relational.Monad.Register,
   module Database.Relational.Relation,
   module Database.Relational.Set,
+  module Database.Relational.Sequence,
   module Database.Relational.Scalar,
   module Database.Relational.Type,
   module Database.Relational.Effect,
@@ -83,6 +84,7 @@ import Database.Relational.Monad.Assign (Assign)
 import Database.Relational.Monad.Register (Register)
 import Database.Relational.Relation
 import Database.Relational.Set
+import Database.Relational.Sequence
 import Database.Relational.Scalar (ScalarDegree)
 import Database.Relational.Type hiding
   (unsafeTypedKeyUpdate, unsafeTypedDelete,

relational-query/src/Database/Relational/Sequence.hs

@@ -3,7 +3,7 @@
 {-# LANGUAGE FlexibleContexts #-}
 
 -- |
--- Module      : Sequence
+-- Module      : Database.Relational.Sequence
 -- Copyright   : 2017 Kei Hibino
 -- License     : BSD3
 --
@@ -12,7 +12,7 @@
 -- Portability : unknown
 --
 -- This module provides structures about sequence tables.
-module Sequence (
+module Database.Relational.Sequence (
   Sequence (..), seqRelation,
   unsafeSpecifySequence,