I'm using Oxygen 15.0 with Saxon PE 9.5.0.2 XSLT 2.
My XSLT is rusty, and I was struggling with the expression of particular
descendant expression. After a number of botched attempts, I cam up with two
versions that seemed to work. (Yes, I will use the ancestor:: axis, but I want
to know what is happening here.)
The following code operates on an xhtml document.
1) <xsl:variable name="table-node" select="//*:table[//*:tr[count(*:td) =
3]][1]"/>
2) <xsl:variable name="table-ancestors"
select="//*[descendant::node()=$table-node]"/>
3) <xsl:variable name="table-parents" select="//*[descendant::node()[. is
$table-node]]"/>
4) <xsl:variable name="intersection" select="$table-ancestors intersect
$table-parents"/>
<xsl:message>
3.1) <xsl:text>table-parents</xsl:text><xsl:value-of
select="count($table-parents)"/>
</xsl:message>
<xsl:message>
2.1) <xsl:text>table-ancestors</xsl:text><xsl:value-of
select="count($table-ancestors)"/>
</xsl:message>
<xsl:message>
4.1) <xsl:text>intersection</xsl:text><xsl:value-of
select="count($intersection)"/>
</xsl:message>
I was suspicious of the expression in 2) that derives $table-ancestors, but it
appeared to work. However, 2.1) results in a value one greater than 3.1); in
the particular case, 15 vs 14.
4.1) results in 14, so all but one on the nodes is common. The extra node, as
expected, is last node of $table-ancestors, which is the table node itself.
What is it about 2) that results in the extra value?
Peter West
"Ask and it will be given you; seek, and you will find; knock, and it will be
opened to you."
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