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File: Data.xml

<?xml version="1.0"?>
<numberlist>
  <number>127</number>
  <number>23</number>
  <number>10</number>
</numberlist>

File: Transform.xslt

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

  <xsl:output method="text" indent="no"/>
  <xsl:strip-space elements="*"/>

  <xsl:variable name="newline">
  <xsl:text></xsl:text>
  </xsl:variable>

  <xsl:template match="/">
    <xsl:for-each select="numberlist/number">
      <xsl:sort select="."/>
      <xsl:value-of select="."/>
      <xsl:value-of select="$newline"/>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>

Output:

1012723