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isXPath1 / isXPath2 -- not(/..)

• From: "Hermann Stamm-Wilbrandt" <STAMMW@de.ibm.com>
• To: xml-dev@lists.xml.org
• Date: Sat, 19 Dec 2015 15:12:10 +0100

More than a year ago Jonathan Robie tweeted on this nice XPath expression:
false()=/..

The expression is true for XPath 1.0 and false for XPath 2.0.
Therefore the expression can be named "isXPath1".

I cannot find his tweet anymore, nor my reply tweet with this minimal
equivalent "isXPath1" expression:
(4=5)=/..

I was not able to reduce the expression until today.
Still above expression is minimal for "isXPath1", but a character can be
reduced for "isXPath2":
not(/..)

This expression is true for XPath 2.0 and false for XPath 1.0.

$ java net.sf.saxon.Query -qs:"(4=5)=/.." \!omit-xml-declaration=yes ; echo
false
$ java net.sf.saxon.Query -qs:"not(/..)" \!omit-xml-declaration=yes ; echo
true
$ java net.sf.saxon.Query 2>&1 | head -2
No query file name
Saxon-HE 9.6.0.8J from Saxonica
$


Mit besten Gruessen / Best wishes,

Hermann Stamm-Wilbrandt
Compiler Level 3 support & Fixpack team lead
IBM DataPower Gateways     (⬚ᵈᵃᵗᵃ / ⣏⠆⡮⡆⢹⠁⡮⡆⡯⠂⢎⠆⡧⡇⣟⡃⡿⡃)
https://www.ibm.com/developerworks/mydeveloperworks/blogs/HermannSW/    
https://twitter.com/HermannSW/     https://stamm-wilbrandt.de/GraphvizFiddle/
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• Follow-Ups:
  • Re: isXPath1 / isXPath2 -- not(/..)
    • From: Michael Kay <mike@saxonica.com>
  • Re: isXPath1 / isXPath2 -- not(/..)
    • From: David Carlisle <d.p.carlisle@gmail.com>