tough problem

Hello!

I am trying to produce comma-separated list of text nodes
from any XML using the following transform:

<xsl:template match="/">
 <xsl:apply-templates select="top"/>
</xsl:template>

<xsl:template match="text()[normalize-space()!='']">
 <xsl:value-of select="."/>,
</xsl:template>


However I can't get rid of trailing comma. 
I tried the 
  <xsl:if test="position()!=1"> 
test, however the position() is equal 1 more then once.

Any ideas how can I get around?

Thanks,
Evg




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