See <http://orgmode.org/manual/Include-files.html>
```
% pandoc -f org -t native
Text

#+include: "command/3510-subdoc.org"

#+INCLUDE: "command/3510-src.hs" src haskell
#+INCLUDE: "command/3510-export.latex" export latex

More text
^D
[ Para
  [ Str "Text" ]
, Header 1
  ( "subsection", [], [] )
  [ Str "Subsection" ]
, Para
  [ Str "Included", Space, Str "text" ]
, Plain
  [ Str "Lorem", Space, Str "ipsum." ]
, CodeBlock
  ( "", [ "haskell" ], [] ) "putStrLn outString\n"
, RawBlock
  ( Format "latex" ) "\\emph{Hello}"
, Para
  [ Str "More", Space, Str "text" ]
]
```