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Re: [xsl] tag in input document breaks


Subject: Re: [xsl] <param> tag in input document breaks <xsl:copy-of select="." />
From: Evgeny Turnaev <turnaev.e@xxxxxxxxx>
Date: Wed, 3 Jul 2013 15:03:15 +0400

2013/7/3 Michael Kay <mike@xxxxxxxxxxxx>:
>
> How are you viewing the output?

In console. libxslt_tutorial.c outputs to stdout. I am also getting
same with xsltproc cmd util.

>
> If this is the serialized output of the XSLT processor, then it's wrong and
clearly a bug in the XSLT processor. On the other hand, if it is the result of
loading the (invalid) HTML into a browser and then viewing the resulting DOM,
then it might well be legitimate - browsers do strange things with invalid
HTML.
>
> Either way, one has to ask why you are using the HTML output method when
your stylesheet result is not HTML.

That is definitely a good question. Originally issue was found by my
colleague (xslt programmer while i am a python programmer).
Our output is mostly html so to prevent xslt engine from closing empty
tags (<span></span> -> <span/>) we use output method html in our
templates. And so my colleague stumbled the issue while trying to
debug input tree using this construction:
<xsl:template match="/">
   <textarea><xsl:copy-of select="."></textarea>
</xsl:template>
So this issue looks like a minor for us, because this is not our
primary usage. It is seems we still can traverse the tree.
the only thing that is not working <xsl:copy-of select="param">.
But still it looks like a bug.

>
> Michael Kay
> Saxonica
>
>
> On 3 Jul 2013, at 09:44, Evgeny Turnaev wrote:
>
>> Hello.
>>  Dear All, i have searched the web and this mail list and found
>> nothing related to my question.
>>  Sorry if this is something obvious and mentioned in xml standard but
>> this really looks strange to me.
>>
>> The Question:
>>
>> Given this input document:
>> <?xml version="1.0" encoding="UTF-8" ?>
>> <param>
>> <sometag>Hello world</sometag>
>> </param>
>>
>> And this simple stylesheet:
>> <?xml version="1.0" encoding="utf-8"?>
>> <xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
>> <xsl:output method="html"/>
>>
>> <xsl:template match="/">
>>    <xsl:copy-of select="." />
>> </xsl:template>
>>
>> </xsl:stylesheet>
>>
>> The output is:
>> <param>
>>
>> While i expect output:
>> <param>
>> <sometag>Hello world</sometag>
>> </param>
>>
>> However changing <param> tag in input document to some other tag fixes
>> problem and output match expectations.
>> Also changing <xsl:output method="html"/> to <xsl:output
>> method="xml"/> fixes problem, but i really want to keep <xsl:output
>> method="html"/>.
>> I have stumbled this while making transform on xml-rpc output: it
>> starts with <methodResponse><params><param> and all the contents of
>> <param> tag is missing in output.
>> Is there something special about <param> tag in input document? I
>> suppose input document tags should not anyhow change result of
>> <xsl:copy-of select="." />, is'nt it?
>>
>> Some technical info:
>> Transformation code was taken literally as copy of example from page:
>> http://xmlsoft.org/XSLT/tutorial/libxslttutorial.html
>> (
>> and then
>> gcc ./libxslt_tutorial.c -o ./test_xslt -I/usr/include/libxml2 -lxml2
-lxslt
>> ./test_xslt output.xsl xml_rpc.xml
>> )
>> System: ubuntu 12.04
>> Linux mtnp 3.2.0-36-generic #57-Ubuntu SMP Tue Jan 8 21:44:52 UTC 2013
>> x86_64 x86_64 x86_64 GNU/Linux
>>
>> libxml & libxslt installed via apt-get
>> Package: libxml2
>> Priority: standard
>> Section: libs
>> Installed-Size: 1745
>> Maintainer: Ubuntu Developers <ubuntu-devel-discuss@xxxxxxxxxxxxxxxx>
>> Original-Maintainer: Debian XML/SGML Group
>> <debian-xml-sgml-pkgs@xxxxxxxxxxxxxxxxxxxxxxx>
>> Architecture: amd64
>> Version: 2.7.8.dfsg-5.1ubuntu4
>> Depends: libc6 (>= 2.15), zlib1g (>= 1:1.2.3.3.dfsg)
>>
>>
>> Package: libxslt1.1
>> Priority: optional
>> Section: libs
>> Installed-Size: 468
>> Maintainer: Ubuntu Developers <ubuntu-devel-discuss@xxxxxxxxxxxxxxxx>
>> Original-Maintainer: Debian XML/SGML Group
>> <debian-xml-sgml-pkgs@xxxxxxxxxxxxxxxxxxxxxxx>
>> Architecture: amd64
>> Source: libxslt
>> Version: 1.1.26-8ubuntu1
>> Depends: libc6 (>= 2.4), libgcrypt11 (>= 1.4.5), libxml2 (>= 2.7.4)
>>
>>
>> Any thoughts or suggestions?


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