Sub- and Superscript

Hi all,

I'm trying to add sub- and superscripts to my template. I use vertical-align to achieve this. 
It works fine.., but when the sub- and superscript are standing next to each other I would like a result like this 

 1
A
 2

instead of
  1
A
 2

The sub- and superscript must be at the same postion.

Does anybody know how to achieve this ?

Thanks!

Greetings,
Dineke van den Bos


XML
A<sub>2</sub><sup>1</sup>

XSL
<xsl:template match="sub">
  <fo:inline vertical-align="sub">
    <xsl:apply-templates/>
  </fo:inline>
</xsl:template>

<xsl:template match="sup">
  <fo:inline vertical-align="super">
    <xsl:apply-templates/>
  </fo:inline>
</xsl:template>



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