<?xml version="1.0"?>
<t:transform version="1.0" xmlns:t="http://www.w3.org/1999/XSL/Transform">

<t:output method="text"/>

<t:template match="/">
<t:variable name="fios" select="/document/item[@name='fio']/textlist/text"/>
<t:variable name="mails" select="/document/item[@name='mail']/textlist/text"/>
<t:for-each select="$fios">
<t:variable name="p" select="position()"/>
<t:if test="$p!=1">, </t:if>
<t:value-of select="."/>, <t:value-of select="$mails[$p]"/>
</t:for-each>
</t:template>


</t:transform>