Persian, Arabic or Hebrew FO output, need to get writing-mode=rl-tb

[Kia Teymourian <kiat@cs.tu-berlin.de>]

Hi,
could you please tell me how can I get in my .FO output file, the attribute writing-mode="rl-tb"?
I need to have in my .FO file something like this:

<fo:block font-size="14pt"  font-family="Tahoma"  line-height="14pt" 
  space-after.optimum="12pt"   writing-mode="rl-tb" >
   &#x62a;&#x6cc;&#x645;&#x648;&#x631;&#x6cc;&#x627;&#x646;
</fo:block>

I send my XML file with dir="rtl" attribute to the XSLT processor, and the dir="rtl" is just once defined in the root tag
<book dir="rtl">  or <article dir="rtl">.
Is this feature implemented?
Or should I add this part in my customizing layer?

How can I get <fo:bidi-override> objects in my .FO output? Is bidi-override implemented?

Thanks,
Kia Teymourian