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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
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