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isXPath1 / isXPath2 -- not(/..)

More than a year ago Jonathan Robie tweeted on this nice XPath expression:

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:

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":

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

Mit besten Gruessen / Best wishes,

Hermann Stamm-Wilbrandt
Compiler Level 3 support & Fixpack team lead
IBM DataPower Gateways     (⬚ᵈᵃᵗᵃ / ⣏⠆⡮⡆⢹⠁⡮⡆⡯⠂⢎⠆⡧⡇⣟⡃⡿⡃)
https://twitter.com/HermannSW/     https://stamm-wilbrandt.de/GraphvizFiddle/
IBM Deutschland Research & Development GmbH
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