<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:template match="text()" name="distinctSubstrings">
<xsl:param name="pText" select="."/>
<xsl:param name="poutDelim"/>
<xsl:param name="pFoundDistinctSubs" select="','"/>
<xsl:param name="pCountDistinct" select="0"/>
<xsl:if test="$pText">
<xsl:variable name="vnextSub" select="substring-before(concat($pText, ','), ',')"/>
<xsl:variable name="vIsNewDistinct" select=
"not(contains(concat($pFoundDistinctSubs, ','), concat(',', $vnextSub, ',')))"/>
<xsl:variable name="vnextDistinct" select=
"substring(concat($poutDelim,$vnextSub), 1 div $vIsNewDistinct)"/>
<xsl:value-of select="$vnextDistinct"/>
<xsl:variable name="vNewFoundDistinctSubs"
select="concat($pFoundDistinctSubs, $vnextDistinct)"/>
<xsl:variable name="vnextOutDelim"
select="substring(',', 2 - ($pCountDistinct > 0))"/>
<xsl:call-template name="distinctSubstrings">
<xsl:with-param name="pText" select="substring-after($pText, ',')"/>
<xsl:with-param name="pFoundDistinctSubs" select="$vNewFoundDistinctSubs"/>
<xsl:with-param name="pCountDistinct" select="$pCountDistinct + $vIsNewDistinct"/>
<xsl:with-param name="poutDelim" select="$vnextOutDelim"/>
</xsl:call-template>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
XSLT 1.0 to omit duplicate value on a comma-separated string.
INPUT :- <t>asdf,asdf,weqt,fd,asdf,asdf</t>
OUTPUT :- asdf,weqt,fd
INPUT :- <t>asdf,asdf,weqt,fd,asdf,asdf</t>
OUTPUT :- asdf,weqt,fd
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