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Re: [xsl] Why does Chrome's XSL processor validate my XML files when processing them, and how can I make it stop doing that so that it processes them faster?

2021-02-21 03:38:54
I would be rather surprised if XSD validation is the actual cause of the 
problem. A simple way to verify this hypothesis would be to see what happens 
when the XML is invalid against the schema. There's something else going on 
here -- but I'm afraid I don't know what it is.

Michael Kay
Saxonica

On 21 Feb 2021, at 02:00, Wolfhart Totschnig 
wolfhart(_dot_)totschnig(_at_)mail(_dot_)udp(_dot_)cl 
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

Dear list,

I have run into a performance issue to which I cannot find the solution.

I have made a couple of changes to my project in the last couple of days. The 
project mainly consists in many small XML files that I write with an XML 
editor but read with a web browser (Chrome). That is, I have an XSL 
stylesheet that transforms these XML files into HTML and which is executed by 
the browser when loading the files. Now, one of the changes I made is to 
switch from a DTD to an XSD for my XML files. And the problem is that now the 
browser loads the files noticeably more slowly. Concretely, I see a white 
screen for a fraction of a second before the file is displayed. I am very 
puzzled by this. I would have thought that switching from a DTD to an XSD 
would not have any effect on the performance of the XSL processor because the 
processor would ignore the associated DTD or XSD, respectively. But 
apparently that is not the case. Hence my question: Why does Chrome's XSL 
processor validate my XML files when processing them? I don't understand why 
it would do that. I !
 just want the processor to execute the code, i.e., transform the XML into 
HTML. Also, and more importantly, is there a way -- a line of code that I could 
add to the XSL stylesheet -- that would make it stop validating the files and 
hence process them faster?

Two notes:

1) Since I made several changes to my project, I am not 100 % certain that 
the drop in performance was caused by the switch from DTD to XSD. But I think 
that I have excluded all other possibilities by reversing the changes step by 
step. So I am 95 % certain that this is where the problem lies.

2) I could not test the issue with another web browser because Chrome is the 
only browser that I can get to execute the stylesheet at all. All other 
browsers that I have tried refuse to execute the stylesheet on my local XML 
files, supposedly for security reasons.

Thanks in advance for your help!
Wolfhart


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