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diff --git a/src/Language/GraphQL/AST/Core.hs b/src/Language/GraphQL/AST/Core.hs
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+-- | This is the AST meant to be executed.
+module Language.GraphQL.AST.Core where
+
+import Data.Int (Int32)
+import Data.List.NonEmpty (NonEmpty)
+import Data.String
+
+import Data.Text (Text)
+
+type Name = Text
+
+type Document = NonEmpty Operation
+
+data Operation = Query    (NonEmpty Field)
+               | Mutation (NonEmpty Field)
+                 deriving (Eq,Show)
+
+data Field = Field (Maybe Alias) Name [Argument] [Field] deriving (Eq,Show)
+
+type Alias = Name
+
+data Argument = Argument Name Value deriving (Eq,Show)
+
+data Value = ValueInt Int32
+           -- GraphQL Float is double precision
+           | ValueFloat Double
+           | ValueString Text
+           | ValueBoolean Bool
+           | ValueNull
+           | ValueEnum Name
+           | ValueList [Value]
+           | ValueObject [ObjectField]
+             deriving (Eq,Show)
+
+instance IsString Value where
+  fromString = ValueString . fromString
+
+data ObjectField = ObjectField Name Value deriving (Eq,Show)