((output
  (((f.ml (1 0) (1 3)) (paragraph (((f.ml (1 0) (1 3)) (word foo)))))
   ((f.ml (2 0) (2 7))
    (0
     (label
      ((root (f.ml (page f.ml) 00000000000000000000000000000000) f.ml)
       (label bar)))
     (((f.ml (2 3) (2 6)) (word Bar)))))))
 (warnings
  ( "File \"f.ml.mld\":\
   \nPages (.mld files) should start with a heading.")))
