Format and str_formatter

Format and str_formatter

[Christian Sternagel]

Hi there,

Recently I started to use the Format module's support for custom tags 
(in order to print XML). I noticed a somehow strange behavior (at least 
it seems strange to me). What follows is a minimal example:

First enable tag printing via

   # Format.set_tags true;;
   - : unit = ()

Now consider the printing function

   # let f fmt = Format.fprintf fmt "@{<test>test@}";;
   val f : Format.formatter -> unit = <fun>

When used on std_formatter it produces what I expected, namely

   # f Format.std_formatter;;
   <test>test</test>- : unit = ()

On str_formatter however the result is different.

   # f Format.str_formatter;;
   - : unit = ()
   # Format.flush_str_formatter();;
   - : string = "test"

Where have my tags gone? What am I missing here?

thnx for any help

cheers

christian