XSL-FO side-region's border question

Hi folks,

A question about XSL-FO spec.
the following example:

 <fo:simple-page-master master-name="page-with-side-region">
  <fo:region-body margin="2cm"/>
  <fo:region-start extent="2cm" reference-orientation="90"
                                border-end="thin solid blue"/>
 </fo:simple-page-master>

I expected the side-region's border-end is adjacent to the region-body;
the reference-orientation="90" rotates the side-region's content, but 
the border/padding use the direction of its parent area.  Is it true?

(maybe, i'm misunderstanding the [4.2.3 Geometric Definitions] 
"...Thus the edges designated for the content-rectangle may not 
correspond with the same-named edges on the padding-, border-, and 
allocation-rectangles.")


Murakami Shinyu


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