XML/XSLT stylesheet/for loop

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Put a for loop into string-join function

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="2.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="/">
    <html>
      <body>
        <xsl:value-of
          select="string-join((for $i in 1 to 3 return string($i * $i)), " => ")" />
        <br />
      </body>
    </html>
  </xsl:template>
</xsl:stylesheet>
Output:
<html>
   <body>1 =&gt; 4 =&gt; 9<br></body>
</html>