Find Text Node with largest number of elements preceeding - xslt

Question

With XML:
<?xml version="1.0" encoding="UTF-8"?>
<Root>
<A>
<B>
<C>
<Name>Bob</Name>
</C>
<D>
<Operation>Yes</Operation>
<E>
<Operation>No</Operation>
</E>
</D>
</B>
</A>
</Root>
I have XSLT that produces text output:
/Root/A/B/C/Name
/Root/A/B/D/Operation
/Root/A/B/D/E/Operation
Problem:
The deepest text node is /Root/A/B/D/E/Operation.
I'd like to be able to arrive at the number 5 (the text node with the largest / max number of element levels in front, prior to producing the output above.
So it should work for any XML document. Element names are unknown.

Answer 1

The XSLT 3 stylesheet
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="3.0">
<xsl:output method="text"/>
<xsl:template match="/">
<xsl:value-of select="let $leaf-elements := //*[not(*)],
$max-anc := max($leaf-elements/count(ancestor::*))
return ($max-anc, $leaf-elements!string-join(ancestor-or-self::*/name(), '/'))" separator="
"/>
</xsl:template>
</xsl:stylesheet>
run against your sample input outputs
5
Root/A/B/C/Name
Root/A/B/D/Operation
Root/A/B/D/E/Operation
Online sample https://xsltfiddle.liberty-development.net/6qVRKwh.