At 2007-12-24 15:14 +0530, Mukul Gandhi wrote:
I am trying to use the 'except' operator (to calculate set
difference) in a XSLT 2.0 stylesheet (using Saxon 9-b). My attempt is
below:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="2.0">
<xsl:output method="text" />
<xsl:template match="">
<xsl:variable name="seq1" select="(1,2,3)" />
<xsl:variable name="seq2" select="(1,2)" />
<xsl:value-of select="$seq1 except $seq2" />
</xsl:template>
</xsl:stylesheet>
The sets (sequences) will contain atomic integer values (the values
are not nodes). The above stylesheet is giving error:
XPTY0004: Required item type of first operand of 'except' is node();
supplied value has item type xs:integer
Is it possible to cast atomic values like integers above to a suitable
node, so that except operator works on such data ?
Not that I know of ... the except operator works on the *identity* of
nodes in the tree, so in order to get a match on like values you
would have to somehow create the same nodes for the same values.
But since you want to use values, why not go with your original idea
of just comparing values?
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="2.0">
<xsl:output method="text" />
<xsl:template match="/">
<xsl:variable name="seq1" select="(1,2,3)" />
<xsl:variable name="seq2" select="(1,2)" />
<xsl:value-of select="$seq1[not(. = $seq2)]" />
</xsl:template>
</xsl:stylesheet>
My earlier warning when you asked about the "except" operator was
that your proposal was using values instead of identity ... since
atomic values don't have identity, you'll want to use values. Your
earlier example didn't distinguish the use of atomic values.
I hope this helps.
. . . . . . . . . . . . . Ken
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