Re: [xsl] Suggestion for handling an endless loop

Subject: Re: [xsl] Suggestion for handling an endless loop
From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 18 Oct 2019 23:09:18 -0000
You're in oXygen though, aren't you? I think oXygen chooses a different XSLT
processor based on the version attribute you specify.

With this kind of thing the devil is always in the detail. I've seen similar
problems, for example, because a stylesheet did

<xsl:if test="contains(//title, 'xxx')">....

In 1.0 that ignores any title after the first; in 2.0 it has to search the
whole document so it can report an error if there is more than one title. If
that's done within a loop and it's a large document then the effect can be
dramatic. But that's just an anecdote about the sort of thing that can happen;
there are 100 other possible explanations and you can't diagnose this kind of
thing without detailed probing.

Comparing the -T output of the two runs might yield interesting insights.

Michael Kay

> On 18 Oct 2019, at 23:35, Mark Giffin m1879@xxxxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> Text change in stylesheet only, so I changed this:
> <xsl:stylesheet version="2.0">
> to this:
> <xsl:stylesheet version="1.0">
> That's the entire fix. I did not change XSLT processors or any other code.
> On 10/18/2019 2:54 PM, Michael Kay mike@xxxxxxxxxxxx
<mailto:mike@xxxxxxxxxxxx> wrote:
>> When you say you "change it to 1.0", do you mean that you change the
version number in the xsl:stylesheet element, or that you change the XSLT
processor you are using, or both?
>> Michael Kay
>> Saxonica
>>> On 18 Oct 2019, at 22:06, Mark Giffin m1879@xxxxxxxxxxxxx
<mailto:m1879@xxxxxxxxxxxxx> <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx
<mailto:xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>> wrote:
>>> I'm getting what appears to be an endless loop while running XSLT 2.0. It
hangs when transforming a certain XML file, and I can watch the memory
consumption rise to as much as 9 GB, and it apparently will never end. I have
to force it to stop. When I change it back to XSLT 1.0, it runs fine, and when
it hits the same file it hung up on with 2.0, it transforms in a second or two
with 1.0. The XSLT does not use any 2.0 capabilities yet. The only change is
changing 2.0 to 1.0 in <xsl:stylesheet version="2.0">.
>>> I'm interested in methods to debug something like this. Where to look? I
notice Oxygen has an XSLT profiler.
>>> Details:
>>> The XSLT is running under the DITA Open Toolkit version 3.3.2 (late
model). I am converting an HTML-based publishing output from a much older
version of the DITA OT, 1.8.5 (where the code worked). It looks like the 3.3.2
OT uses Saxon-HE-9.8.0-14.jar.
>>> Thanks,
>>> Mark
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