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" ]
]
```