It's the old paradox of universal quantification applied to an empty set: when
there are no unicorns, "every unicorn has one horn" and "every unicorn has
three horns" are both true. Bertrand Russell used the example "The present King
of France is bald" (https://en.wikipedia.org/wiki/Definite_description).
[] instance of array(xs:string)
is true if every member of array is of type xs:string, and under the usual
conventions of predicate logic, that statement is true when the array has no
members.
Michael Kay
Saxonica
On 28 Aug 2020, at 09:32, Ihe Onwuka <ihe(_dot_)onwuka(_at_)gmail(_dot_)com>
wrote:
This returns true for xs:string and xs:integer
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform
<http://www.w3.org/1999/XSL/Transform>"
xmlns:xs="http://www.w3.org/2001/XMLSchema <http://www.w3.org/2001/XMLSchema>"
xmlns:array="http://www.w3.org/2005/xpath-functions/array
<http://www.w3.org/2005/xpath-functions/array>"
xmlns:map="http://www.w3.org/2005/xpath-functions/map
<http://www.w3.org/2005/xpath-functions/map>"
version="3.0" expand-text="yes"
exclude-result-prefixes="array map xs">
<xsl:template name="xsl:initial-template">
{[] instance of array(xs:string)}
</xsl:template>
</xsl:stylesheet>
Getting this on saxon 10.1
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