Add definition module

src/Language/GraphQL/AST.hs

@@ -5,10 +5,8 @@
 module Language.GraphQL.AST
     ( Alias
     , Argument(..)
-    , Definition(..)
-    , Directive(..)
-    , Document
     , ExecutableDefinition(..)
+    , Directive(..)
     , FragmentDefinition(..)
     , Name
     , NonNullType(..)
@@ -28,15 +26,6 @@ import Data.Int (Int32)
 import Data.List.NonEmpty (NonEmpty)
 import Data.Text (Text)
 
--- * Document
-
--- | GraphQL document.
-type Document = NonEmpty Definition
-
--- | All kinds of definitions that can occur in a GraphQL document.
-newtype Definition = ExecutableDefinition ExecutableDefinition
-    deriving (Eq, Show)
-
 -- | Name
 type Name = Text
 
@@ -74,8 +63,6 @@ type SelectionSet = NonEmpty Selection
 -- | Field selection.
 type SelectionSetOpt = [Selection]
 
--- * Field
-
 -- | Single GraphQL field.
 --
 -- The only required property of a field is its name. Optionally it can also