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diff --git a/src/Language/Fiddle/Ast/FileInterface.hs b/src/Language/Fiddle/Ast/FileInterface.hs
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+++ b/src/Language/Fiddle/Ast/FileInterface.hs
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+module Language.Fiddle.Ast.FileInterface where
+
+-- Definitions for file interfaces. These interfaces contain an abstract
+-- representation of the symbols and information exported by a fiddle file.
+-- These interfaces are also serializable, and when compiling a fiddle file, all
+-- the import statements should supply an fdi (fiddle interface) file to speed
+-- up subsequent compilations.
+
+-- import Data.Text
+-- 
+-- data ObjectType = ObjectType
+--   { objectTypeSize :: Word32
+--   }
+-- 
+-- data Metatype
+--   = Object
+--       { objectLocation :: Word64,
+--         objectType :: Text
+--       }
+--   | Type
+--       { typeSizeBytes :: Word32
+--       }
+-- 
+-- data Element a = Element
+--   { elementFullyQualifiedSymbol :: Text,
+--     elementDocumentation :: Maybe Text,
+--     elementMetatype :: Metatype,
+--     elementAnnotation :: a
+--   }
+-- 
+-- data FileInterface a = FiddleInterface
+--   { exportedElements :: [Element a]
+--   }