Re: XSLT/XQuery polyglot

From: "Hermann Stamm-Wilbrandt" <STAMMW@de.ibm.com>
To: "Hermann Stamm-Wilbrandt" <STAMMW@de.ibm.com>
Date: Wed, 16 Dec 2015 12:09:27 +0100

Play the video

Polyglot script q.xml does real computation. It evaluates "isXPath1" XPath expression I created based on a longer one from Jonathan Robie. It outputs "false" for XPath 2.0 (Saxon XQuery, Saxon XSLT and DataPower XQuery processor) and "true" for XPath 1.0 (DataPower XSLT processor):

$ cat q.xml
<foo xsl:version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:value-of select="(4=5)=/.."/>{(4=5)=/..}
</foo>
$

Here are the 4 executions:
$ java net.sf.saxon.Query -q:q.xml ; echo
<?xml version="1.0" encoding="UTF-8"?><foo xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xsl:version="2.0"><xsl:value-of select="(4=5)=/.."/>false</foo>
$
$ java net.sf.saxon.Transform -xsl:q.xml -s:q.xml ; echo
<?xml version="1.0" encoding="UTF-8"?><foo>false{(4=5)=/..}
</foo>
$
$ xj --xquery q.xml dummy.xml ; echo
<?xml version="1.0" encoding="UTF-8"?>
<foo xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xsl:version="2.0"><xsl:value-of select="(4=5)=/.."/>false</foo>
$
$ xj q.xml dummy.xml ; echo
<?xml version="1.0" encoding="UTF-8"?>
<foo>true{(4=5)=/..}
</foo>
$

["xj" DataPower command line XSLT/XQUery processor is not available to customers, they have to use DataPower appliance]

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/
----------------------------------------------------------------------
IBM Deutschland Research & Development GmbH
Vorsitzende des Aufsichtsrats: Martina Koederitz
Geschaeftsfuehrung: Dirk Wittkopp
Sitz der Gesellschaft: Boeblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294

Hermann Stamm-Wilbrandt---16.12.2015 04:22:19---Hi, I did some searches but found no other mentioning of this.

From: Hermann Stamm-Wilbrandt/Germany/IBM@IBMDE
To: xml-dev@lists.xml.org
Date: 16.12.2015 04:22
Subject: XSLT/XQuery polyglot

Hi,
I did some searches but found no other mentioning of this.
From
https://en.wikipedia.org/wiki/Polyglot_(computing)... a polyglot is a computer program or script written in a valid form of multiple programming languages, which performs the same operations or output independent of the programming language used to compile or interpret it. ...

Simple "poly.xml" is a XSLT/XQuery polyglot (same output): $ java net.sf.saxon.Query -q:poly.xml > xq $ java net.sf.saxon.Transform -xsl:poly.xml -s:poly.xml > xsl $ diff xq xsl $ cat xq ; echo <?xml version="1.0" encoding="UTF-8"?><xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"><xsl:template match="/"><xsl:copy-of select="document('')"/></xsl:template></xsl:stylesheet> $ $ cat poly.xml <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"><xsl:template match="/"><xsl:copy-of select="document('')"/></xsl:template></xsl:stylesheet> $

I found no option to avoid output of xml declaration in Saxon XQuery as command line option.
declare option saxon:output "omit-xml-declaration=yes"; would need to stay before output and break XSLT that way.
At least the XSLT part would be a cheating quine at most only:
https://en.wikipedia.org/wiki/Quine_(computing)#.22Cheating.22_quines
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/---------------------------------------------------------------------- IBM Deutschland Research & Development GmbH Vorsitzende des Aufsichtsrats: Martina Koederitz Geschaeftsfuehrung: Dirk Wittkopp Sitz der Gesellschaft: Boeblingen Registergericht: Amtsgericht Stuttgart, HRB 243294

References:
- XSLT/XQuery polyglot
  - From: "Hermann Stamm-Wilbrandt" <STAMMW@de.ibm.com>

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