This is very nice to know -- thanks David and Mike Kay.

Cheers, Wendell

From: David Carlisle d.p.carlisle@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, May 31, 2023 11:57 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re:  [XSL 3.0] Function that check if a xs:string can be
converted as a xs:double



On Wed, 31 May 2023 at 16:08, Piez, Wendell A. (Fed)
wendell.piez@xxxxxxxx<mailto:wendell.piez@xxxxxxxx>
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx<mailto:xsl-list-service@xxxxxxxxxxxx
rytech.com>> wrote:
Hello,

As an academic exercise it is still interesting to ponder what might be done
without 'castable as'.

I think it was Ken H who once suggested (context of XSLT 1.0)
select="number($str) = number($str)" as NaN is not equal to itself. I can't
say where he got it. (In XPath 1.0 one was forced to be creative.) Or whether
it would work for you in the given context or indeed corresponds to 'castable
as'.

"NaN"  is  true for castable as, but false for number = number

Regards, Wendell

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