How to use XSLT to create distinct values

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An XSLT 1.0 solution that uses key and the generate-id() function to get distinct values:

<?xml version="1.0" encoding="UTF-8"?>
  <xsl:stylesheet
   version="1.0"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" encoding="UTF-8" indent="yes"/>

<xsl:key name="product" match="/items/item/products/product/text()" use="." />

<xsl:template match="https://stackoverflow.com/">

  <xsl:for-each select="/items/item/products/product/text()[generate-id()
                                       = generate-id(key('product',.)[1])]">
    <li>
      <xsl:value-of select="."/>
    </li>
  </xsl:for-each>

</xsl:template>

</xsl:stylesheet>

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