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

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