Clarification needed about auto-text-indent

> 14.5.21 Automatic Text Indent
> Use the style:auto-text-indent property to specify that the first line of a 
> paragraph is indented by a value that is based on the current font size. 
> For some applications. the style:auto-text-indent property must be used
> together with the fo:margin-left and fo:margin-right properties. If any of
> these properties is missing, its value is assumed to be 0cm.  
> If this property has a value of true and is used together with a
> fo:text-indent property, then the fo:text-indent property is ignored. 

What is missing in this description, is: how much is the indent actually going 
to be?
It's also not clear to me why this is related to the values of margin-left and 
margin-right.

-- 
David Faure, , sponsored by Trolltech to work on KDE,
Konqueror (http://www.konqueror.org), and KOffice (http://www.koffice.org).