I just noticed this new instruction (although it was in the last draft
as well)
Is there any difference bewteen
<xsl:perform-sort select="$in">
<xsl:sort select="."/>
</xsl:perform-sort>
and
<xsl:for-each select="$in">
<xsl:sort select="."/>
<xsl:copy-of select="."/>
</xsl:for-each>
either from a definitional or efficiency point of view?
It's actually been there quite a while, and I think it's proving to be
perhaps the least-used new feature in the spec. It was put in as a
replacement for a sort() function which took a global sort specification as
an argument - rather like xsl:key and key() - but it doesn't seem to be
doing a very useful job.
Actually the equivalence is to:
<xsl:for-each select="$in">
<xsl:sort select="."/>
<xsl:sequence select="."/>
</xsl:for-each>
since no copying is involved.
Michael Kay
http://www.saxonica.com/
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