xslt - Function that can be use to omit duplicate value on a string -

i ask if there function can use to remove duplicate value inside string separated | simplest possible way. have below example of string

1111-1|1111-1|1111-3|1111-4|1111-5|1111-3 

the output i'm expecting is:

1111-1|1111-3|1111-4|1111-5 

thanks in advance.

all presented xslt 1.0 solutions far produce wrong result:

1111-1|1111-4|1111-5|1111-3 

whereas wanted, correct result is:

1111-1|1111-3|1111-4|1111-5 

now, following transformation (no extensions, pure xslt 1.0):

<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> 

when applied on xml document (with string value provided string in question):

<t>1111-1|1111-1|1111-3|1111-4|1111-5|1111-3</t> 

produces wanted, correct result:

1111-1|1111-3|1111-4|1111-5 

explanation:

1. all found distinct substrings concatenated in parameter $pfounddistinctsubs -- whenever next substring delimited input, compare distinct substrings passed in parameter. ensures first in order distinct substring output -- not last in other 2 solutions.

2. we use conditionless value determination, based on fact xslt 1.0 implicitly converts boolean false() 0 , true() 1 whenever used in context requires numeric value. in particular, substring($x, 1 div true()) equivalent substring($x, 1 div 1) is: substring($x, 1) , entire string $x. on other side, substring($x, 1 div false()) equivalent substring($x, 1 div 0) -- is: substring($x, infinity) , empty string.

to know why avoiding conditionals important: watch pluralsight course:

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