2 files changed, 12 insertions, 2 deletions
diff --git a/src/Language/GraphQL/Type/Definition.hs b/src/Language/GraphQL/Type/Definition.hs
index 1379018..40055e7 100644
--- a/src/Language/GraphQL/Type/Definition.hs
+++ b/src/Language/GraphQL/Type/Definition.hs
@@ -2,7 +2,8 @@
 
 -- | Types that can be used as both input and output types.
 module Language.GraphQL.Type.Definition
-    ( EnumType(..)
+    ( Arguments(..)
+    , EnumType(..)
     , EnumValue(..)
     , ScalarType(..)
     , Subs
@@ -40,6 +41,16 @@ instance IsString Value where
 -- and the value is the variable value.
 type Subs = HashMap Name Value
 
+-- | Argument list.
+newtype Arguments = Arguments (HashMap Name Value)
+    deriving (Eq, Show)
+
+instance Semigroup Arguments where
+    (Arguments x) <> (Arguments y) = Arguments $ x <> y
+
+instance Monoid Arguments where
+    mempty = Arguments mempty
+
 -- | Scalar type definition.
 --
 -- The leaf values of any request and input values to arguments are Scalars (or
diff --git a/src/Language/GraphQL/Type/Directive.hs b/src/Language/GraphQL/Type/Directive.hs
index 017132c..6ff73d4 100644
--- a/src/Language/GraphQL/Type/Directive.hs
+++ b/src/Language/GraphQL/Type/Directive.hs
@@ -7,7 +7,6 @@ module Language.GraphQL.Type.Directive
 
 import qualified Data.HashMap.Strict as HashMap
 import Language.GraphQL.AST (Name)
-import Language.GraphQL.AST.Core
 import Language.GraphQL.Type.Definition
 
 -- | Directive.