<items>
<product>x</product>
<product>y</product>
<product>z</product>
<product>a</product>
</items>
You could try this:
<xsl:for-each select="product">
<xsl:value-of select="."/>
<xsl:if test="position() != last()">
<xsl:text>, </xsl:text>
</xsl:if>
</xsl:for-each>
GH
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