Finding the longest cell in a table with XSLT 2.0 - xslt-2.0

Question

Building on this topic:
How do I select an XML node with the longest child #text node value with XPath?
I try to find the longest cell in column 1 of a table. Unfortunately I don't know how many ancestors the table has and there are sometimes several within one text- element which should be treated different.
XML
<text><table cols="3" rows="2">
<row >
<cell >first cell first row</cell>
<cell >second cell first row
</cell>
<cell >third cell first row
</cell>
</row>
<row >
<cell >first cell second row</cell>
<cell >this is an incredible long text</cell>
<cell />
</row>
</table>
</text>
XSLT:
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="table">
<xsl:variable name="longest1">
<xsl:sequence select=
"/*/table/row/cell[1][not(string-length(.) < /*/table/row/cell[1]/string-length(.))]"/>
</xsl:variable>
<xsl:value-of select="longest1">
</xsl:template>
</xsl:stylesheet>
The output of course should be "first cell second row", as the second column is not processed.
I'm quite sure all I have to do is to fix the /* of this line:
<xsl:sequence select=
"/*/table/row/cell[1][not(string-length(.) < /*/table/row/cell[1]/string-length(.))]"/>
But I can't manage to see the solution.

Answer 1

As you are writing a template for the table you can simply use
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xs"
version="2.0">
<xsl:template match="table">
<xsl:sequence select="row/cell[1][not(string-length() < current()/row/cell[1]/string-length())]"/>
</xsl:template>
</xsl:stylesheet>
Of course another approach would simply be to sort row/cell[1] by its string-length and taking the last, done in XSLT 3.0 with XPath 3.1 using sort(row/cell[1], function($c) { string-length($c)})[last()] or in XSLT 2.0 using <xsl:variable name="sorted-cells" as="element(cell)*"><xsl:perform-sort select="row/cell[1]"><xsl:sort select="string-length()"/></xsl:perform-sort></xsl:variable><xsl:copy-of select="$sorted-cells[last()]"/>.