using symbols , unicode

[Shubhrata Tewari]

Hi all, 
I want to use the symbol ±  in my output pdf to get text of type a± b. I am 
using this, its not working... any ideas?

<fo:block>
<xsl:value-of select="$mean"/>

<fo:inline font-family="Symbol">

&#x2213;

</fo:inline>

<xsl:value-of select="$stdev"/>

</fo:block>

regards,

Shubhrata