Overlapping, polygonal FOs

[Ingo Macherius <Ingo.Macherius@xxxxxxxxxxxxxxx>]

In response to my XML-article (english translation is work in progress) a
reader asked, if a flow object can have a polygonal border (compared to
rectangular) and if FOs may overlap. I guess he was comparing FO with the
Netscape <layer>-tag. 
In my (quite limited) DSSSL understanding
1) FOs never overlap but include themselves 
   (that is: a FOT is a special grove)
2) FO's are always rectangles

I remember the second point was subject to discussion and polygonal-border
FOs were added on the TODO-list for a DSSSL revision.

Q1: Is my understanding correct ?
Q2: What is the DSSSL/FOT way to represent <layer> like layout (including
    things like transparency).

Thanks in advance,
	++im
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