Re: how to make a log file in XSLT?

On 3/12/2023 9:11 PM, Jean-Luc Chevillard jeanluc.chevillard@xxxxxxxxx
wrote:

Dear list members,

I have been wondering for a long time whether there was a method for
automatically recording some elements of information every time I run
a given script.

As a minimum example, I would start with an empty file
+++++++++++++++
<?xml version="1.0" encoding="UTF-8"?>
<log>
</log>
+++++++++++++++++++++++

After running the script once, the file would become
+++++++++++++++
<?xml version="1.0" encoding="UTF-8"?>
<log>
    <entry>[2023-03-12 (19:53)]</entry>
</log>
+++++++++++++++++++++++

After running the script a second time, one hour later, the file would

+++++++++++++++
<?xml version="1.0" encoding="UTF-8"?>
<log>
    <entry>[2023-03-12 (20:53)]</entry>
   <entry>[2023-03-12 (19:53)]</entry>
</log>
+++++++++++++++++++++++

I have just tried doing this by applying the script at the bottom of
this message (in which "copy.xslt" is the identity transform) to a
base file, but as I expected, I obtained an error message stating:

System ID: C:\JLC\XML_tests\cEnAvaraiyam\log_book_experiment.xslt
Scenario: 4a_log_experiment
XML file: C:\JLC\XML_tests\cEnAvaraiyam\cEnA_MSS_rectangles_chart.xml
XSL file: C:\JLC\XML_tests\cEnAvaraiyam\log_book_experiment.xslt
Engine name: Saxon-PE 11.4
Severity: fatal
Problem ID: XTRE1500
Description: Cannot read a document that was written during the same
transformation:
file:/C:/JLC/XML_tests/cEnAvaraiyam/experimental_log_book.xml
Start location: 17:63
Length: 1
URL: http://www.w3.org/TR/xslt20/#err-XTRE1500

Is there a method for obtaining the desired result by using XSLT?

In some context I think you can fool Saxon by using different URIs e.g.
append some query string to the input URI

<xsl:variable name="current_log_content" select="document($Log_file_name ||
'?foo=bar')"/>