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Bug #5338 ยป Re_ [SaxonJS - Bug #5338] XX Compiler reports _Unknown accumulator NNNNN_ when an accumulator-before or -after call occurs in a global variable - 2022-02-25T14_17_43Z.eml

Alexander Stein, 2022-02-25 15:17

 
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From: "Stein, Alexander J. (Fed)" <alexander.stein@nist.gov>
To: Saxonica Developer Community <inbox+saxonica+f38e+saxon-js@plan.io>
CC: "Piez, Wendell A. (Fed)" <wendell.piez@nist.gov>
Subject: Re: [SaxonJS - Bug #5338] XX Compiler reports "Unknown accumulator
NNNNN" when an accumulator-before or -after call occurs in a global variable
Thread-Topic: [SaxonJS - Bug #5338] XX Compiler reports "Unknown accumulator
NNNNN" when an accumulator-before or -after call occurs in a global variable
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Date: Fri, 25 Feb 2022 14:17:19 +0000
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Also, thanks for this feedback on the transforms. I will definitely want to=
sync up with the team to address these as well, I need their feedback to u=
nderstand the original code (not repro) and the implications of b better. W=
e will follow up soon enough.


________________________________
From: Saxonica Developer Community
Sent: Friday, February 25, 2022 8:14 AM
Subject: [SaxonJS - Bug #5338] XX Compiler reports "Unknown accumulator NNN=
NN" when an accumulator-before or -after call occurs in a global variable


--- In your reply, please do not write below this line ---

Issue #5338<https://saxonica.plan.io/issues/5338?pn=3D1#change-19660> has b=
een updated by Michael Kay.
________________________________

A couple of observations:

(a) you may be able to work around the problem by moving the accumulator-af=
ter call so it is not in a global variable, or by changing the argument to =
accumulator-after so it is not a string literal (e.g use a global parameter=
)

(b) It's probably rather inefficient to use an accumulator like this, if yo=
u only want the value at the end of the document. That's because the curren=
t accumulator value will potentially be stored on every node in the tree. C=
omputing it conventionally using template rules with a special mode, or usi=
ng xsl:iterate or fn:fold-left(), would probably perform better.

________________________________
Bug #5338: XX Compiler reports "Unknown accumulator NNNNN" when an accumula=
tor-before or -after call occurs in a global variable<https://saxonica.plan=
.io/issues/5338?pn=3D1#change-19660>

* Author: Alexander Stein
* Status: In Progress
* Priority: Normal
* Assignee: Michael Kay
* Category: XX compiler
* Sprint/Milestone:
* Applies to JS Branch: 2
* Fix Committed on JS Branch:
* Fixed in JS Release:
* SEF Generated with:
* Platforms:
* Company: Fed
* Contact person: Alexander J. Stein
* Additional contact persons:

Hello, we have a pipelines and software using Saxon HE (Java) variant and t=
he SaxonJS variant with NodeJS to build CLI tooling. We have encountered a =
problem in which running Saxon HE will process a collection of XSL transfor=
ms in shell scripts (running Saxon HE 9.x and/or 10.x) and successfully exe=
cute. Developers wrapping compiling those same transforms into SEF artifact=
s receive compilation failures.

https://github.com/usnistgov/metaschema/issues/180

We receives exceptions like this only with SaxonJS.

Failed to compile stylesheet: Static error in XPath on line 17 in fixtures/=
accumulator_simple.xsl {accumulator-after('total-items')}: Unknown accumula=
tor Q{}total-items
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963
Failed to compile stylesheet:
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963
Static error in XPath on line 17 in fixtures/accumulator_simple.xsl {ac=
cumulator-after('total-items')}: Unknown accumulator Q{}total-items
Failed to compile stylesheet: Static error in XPath on line 27 in fixtures/=
accumulator_basic.xsl {accumulator-after('total-items')}: Unknown accumulat=
or Q{}total-items
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963
Failed to compile stylesheet:
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963
Static error in XPath on line 27 in fixtures/accumulator_basic.xsl {acc=
umulator-after('total-items')}: Unknown accumulator Q{}total-items
Failed to compile stylesheet: Static error in XPath on line 28 in fixtures/=
accumulator_namespaces.xsl {accumulator-after('example:total-items')}: Unkn=
own accumulator Q{https://example.com/ns/custom/0.1}total-items
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963
Failed to compile stylesheet:
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963
Static error in XPath on line 28 in fixtures/accumulator_namespaces.xsl=
{accumulator-after('example:total-items')}: Unknown accumulator Q{https://=
example.com/ns/custom/0.1}total-items


We have build a reproduction library here. With or without namespaces (I re=
-read the XSLT 3.0 standard), it is not clear to me if an accumulator requi=
res a unique namespace or not. I built simple reproductions and none of the=
se seem to compile with current SaxonJS from NPMJS. Instructions to reprodu=
ce in the repo below.

https://github.com/aj-stein-nist/issue180example.git

Let me know if this is my misunderstanding of syntax for accumulators, whet=
her SaxonJS is working as intended, or whether Saxon HE is working as inten=
ded. Similar code compiles with Saxon as intended. Thanks.

________________________________

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Also, thanks for this feedback on the transforms. I will definitely want to=
sync up with the team to address these as well, I need their feedback to u=
nderstand the original code (not repro) and the implications of b better. W=
e will follow up soon enough.<br>
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<b>From:</b> Saxonica Developer Community<br>
<b>Sent:</b> Friday, February 25, 2022 8:14 AM<br>
<b>Subject:</b> [SaxonJS - Bug #5338] XX Compiler reports &quot;Unknown acc=
umulator NNNNN&quot; when an accumulator-before or -after call occurs in a =
global variable
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Issue <a href=3D"https://saxonica.plan.io/issues/5338?pn=3D1#change-19660" =
target=3D"_blank" rel=3D"noopener noreferrer" data-auth=3D"NotApplicable" s=
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#5338</a> has been updated by Michael Kay.
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</ul>
<p>A couple of observations:</p>
<p>(a) you may be able to work around the problem by moving the accumulator=
-after call so it is not in a global variable, or by changing the argument =
to accumulator-after so it is not a string literal (e.g use a global parame=
ter)</p>
<p>(b) It's probably rather inefficient to use an accumulator like this, if=
you only want the value at the end of the document. That's because the cur=
rent accumulator value will potentially be stored on every node in the tree=
. Computing it conventionally using
template rules with a special mode, or using xsl:iterate or fn:fold-left()=
, would probably perform better.</p>
<hr style=3D"width:100%; height:1px; background:#ccc; border:0; margin:1.2e=
m 0">
<h1 style=3D"font-family:&quot;ProximaNova-Bold&quot;,Helvetica,Arial,sans-=
serif; font-weight:normal; margin:0px; font-size:1.3em; line-height:1.4em">
<a href=3D"https://saxonica.plan.io/issues/5338?pn=3D1#change-19660" target=
=3D"_blank" rel=3D"noopener noreferrer" data-auth=3D"NotApplicable" style=
=3D"color:#0088b7; text-decoration:none">Bug #5338: XX Compiler reports &qu=
ot;Unknown accumulator NNNNN&quot; when an accumulator-before
or -after call occurs in a global variable</a></h1>
<ul class=3D"x_details" style=3D"color:#959595; margin-bottom:1.5em">
<li><strong>Author: </strong>Alexander Stein</li><li><strong>Status: </stro=
ng>In Progress</li><li><strong>Priority: </strong>Normal</li><li><strong>As=
signee: </strong>Michael Kay</li><li><strong>Category: </strong>XX compiler=
</li><li><strong>Sprint/Milestone: </strong></li><li><strong>Applies to JS =
Branch: </strong>2</li><li><strong>Fix Committed on JS Branch: </strong></l=
i><li><strong>Fixed in JS Release: </strong></li><li><strong>SEF Generated =
with: </strong></li><li><strong>Platforms: </strong></li><li><strong>Compan=
y: </strong>Fed</li><li><strong>Contact person: </strong>Alexander J. Stein=
</li><li><strong>Additional contact persons: </strong></li></ul>
<p>Hello, we have a pipelines and software using Saxon HE (Java) variant an=
d the SaxonJS variant with NodeJS to build CLI tooling. We have encountered=
a problem in which running Saxon HE will process a collection of XSL trans=
forms in shell scripts (running
Saxon HE 9.x and/or 10.x) and successfully execute. Developers wrapping co=
mpiling those same transforms into SEF artifacts receive compilation failur=
es.</p>
<p><a href=3D"https://github.com/usnistgov/metaschema/issues/180" target=3D=
"_blank" rel=3D"noopener noreferrer" data-auth=3D"NotApplicable" class=3D"x=
_external" style=3D"color:#0088b7">https://github.com/usnistgov/metaschema/=
issues/180</a></p>
<p>We receives exceptions like this only with SaxonJS.</p>
<pre style=3D"font-family:Hack,Consolas,Menlo,&quot;Liberation Mono&quot;,C=
ourier,monospace; font-size:85%; background-color:#ececec; word-wrap:break-=
word; margin:1em 0; padding:8px; border:none; border-radius:3px; width:auto=
; overflow-x:auto; overflow-y:hidden"><code style=3D"font-family:Hack,Conso=
las,Menlo,&quot;Liberation Mono&quot;,Courier,monospace; font-size:85%; bac=
kground-color:#ececec; word-wrap:break-word; border-radius:3px; padding:0.2=
em; margin:0; padding:0">Failed to compile stylesheet: Static error in XPat=
h on line 17 in fixtures/accumulator_simple.xsl {accumulator-after('total-i=
tems')}: Unknown accumulator Q{}total-items=0A=
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963=0A=
Failed to compile stylesheet:=0A=
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963=0A=
Static error in XPath on line 17 in fixtures/accumulator_simple.xsl {ac=
cumulator-after('total-items')}: Unknown accumulator Q{}total-items=0A=
Failed to compile stylesheet: Static error in XPath on line 27 in fixtures/=
accumulator_basic.xsl {accumulator-after('total-items')}: Unknown accumulat=
or Q{}total-items=0A=
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963=0A=
Failed to compile stylesheet:=0A=
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963=0A=
Static error in XPath on line 27 in fixtures/accumulator_basic.xsl {acc=
umulator-after('total-items')}: Unknown accumulator Q{}total-items=0A=
Failed to compile stylesheet: Static error in XPath on line 28 in fixtures/=
accumulator_namespaces.xsl {accumulator-after('example:total-items')}: Unkn=
own accumulator Q{https://example.com/ns/custom/0.1}total-items=0A=
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963=0A=
Failed to compile stylesheet:=0A=
Error Q{http://www.w3.org/2005/xqt-errors}XTDE3340 at xpath.xsl#963=0A=
Static error in XPath on line 28 in fixtures/accumulator_namespaces.xsl=
{accumulator-after('example:total-items')}: Unknown accumulator Q{https://=
example.com/ns/custom/0.1}total-items=0A=
</code></pre>
<p>We have build a reproduction library here. With or without namespaces (I=
re-read the XSLT 3.0 standard), it is not clear to me if an accumulator re=
quires a unique namespace or not. I built simple reproductions and none of =
these seem to compile with current
SaxonJS from NPMJS. Instructions to reproduce in the repo below.</p>
<p><a href=3D"https://github.com/aj-stein-nist/issue180example.git" target=
=3D"_blank" rel=3D"noopener noreferrer" data-auth=3D"NotApplicable" class=
=3D"x_external" style=3D"color:#0088b7">https://github.com/aj-stein-nist/is=
sue180example.git</a></p>
<p>Let me know if this is my misunderstanding of syntax for accumulators, w=
hether SaxonJS is working as intended, or whether Saxon HE is working as in=
tended. Similar code compiles with Saxon as intended. Thanks.</p>
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