a light API in the Haskell binding for accessing the internal data structures

src/runtime/haskell-bind/pgf2.cabal

@@ -14,11 +14,11 @@ extra-source-files:  README
 cabal-version:       >=1.10
 
 library
-  exposed-modules:     PGF2, SG,
+  exposed-modules:     PGF2, PGF2.Internal, SG,
                        -- backwards compatibility API:
                        PGF, PGF.Internal
   other-modules:       PGF2.FFI, PGF2.Expr, PGF2.Type, SG.FFI
-  build-depends:       base >=4.3, bytestring >=0.9,
+  build-depends:       base >=4.3,
                        containers, pretty
   -- hs-source-dirs:      
   default-language:    Haskell2010