I keep forgetting that the sort expression needn't be a single xpath in
xslt2, so in that case you don't need to use the tricky replace regexp
to add the zero, you can do what I had in mind really and use
format-number to express all numbers with teh same number of digits.
This version works up to 6 digits (and without the
restrictions on digit runs being close)
<xsl:for-each select="server">
<xsl:sort>
<xsl:value-of>
<xsl:analyze-string select="@dn" regex="[0-9]+">
<xsl:matching-substring>
<xsl:value-of select="format-number(number(.),'000000')"/>
</xsl:matching-substring>
<xsl:non-matching-substring>
<xsl:value-of select="."/>
</xsl:non-matching-substring>
</xsl:analyze-string>
</xsl:value-of>
</xsl:sort>
<xsl:copy-of select="."/>
</xsl:for-each>
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