Saxon » SaxonC

Is the Linux or MacOS where that happens?

linux. ubuntu 18.04 to be exact

I am sure O'Neil will look into this soon.

As a workaround, if you need to chain stylesheets now, using the following code that uses explicit stylesheet compilation together with the apply_templates_returning_value method has allowed me on both Windows and Linux to chain stylesheets from Python with SaxonC 11.3 HE:

from saxonc import *

with PySaxonProcessor(license=False) as proc:
   print(proc.version)

   xsltproc = proc.new_xslt30_processor()

   source_doc = proc.parse_xml(xml_file_name = 'sample1.xml')

   result_doc = None

   for i in (1,2,3,4):
       print(i)
       sheet = "sheet" +str(i) + ".xsl"
       print('Running sheet ', i)
       print('source_doc is: ', source_doc)

       transform = xsltproc.compile_stylesheet(stylesheet_file = sheet)

       transform.set_global_context_item(xdm_item = source_doc.head)
       result_doc = transform.apply_templates_returning_value(xdm_value = source_doc)
       print('result', i, result_doc)
       
       source_doc = result_doc

   print('Final result:', result_doc)

I understand that workaround only helps if you don't need intermediary results as files on the file system. It was not quite clear whether that was just part of your chosen approach or a requirement for your use case.

Another option obviously is chaining in XSLT using fn:transform. Will try to post an example later on.

Using fold-left plus transform from XSLT works fine for me with SaxonC 11.3 HE and the Python code

from saxonc import *

with PySaxonProcessor(license=False) as proc:
   print(proc.version)

   xsltproc = proc.new_xslt30_processor()

   source_doc = proc.parse_xml(xml_file_name = 'sample1.xml')

   transform = xsltproc.compile_stylesheet(stylesheet_file = 'chain-using-fn-transform-fold-left1.xsl')

   result = transform.apply_templates_returning_value(source_file = 'sample1.xml')

   print(result)

plus the stylesheet code being e.g.

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="3.0"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  exclude-result-prefixes="#all"
  expand-text="yes">
  
  <xsl:param name="sheet-uris" as="xs:string*" select="(1 to 4) ! ('sheet' || . || '.xsl')"/>

  <xsl:mode on-no-match="shallow-copy"/>

  <xsl:template match="/" name="xsl:initial-template">
    <xsl:sequence
      select="fold-left(
                $sheet-uris,
                .,
                function($source-node, $sheet) {
                  transform(map {
                    'source-node' : $source-node,
                    'stylesheet-location' : $sheet
                  })?output
                }
              )"/>
  </xsl:template>
  
</xsl:stylesheet>

To have the result output as a file works too:

from saxonc import *

with PySaxonProcessor(license=False) as proc:
   print(proc.version)

   xsltproc = proc.new_xslt30_processor()

   source_doc = proc.parse_xml(xml_file_name = 'sample1.xml')

   transform = xsltproc.compile_stylesheet(stylesheet_file = 'chain-using-fn-transform-fold-left1.xsl')

   transform.set_cwd('.')

   transform.apply_templates_returning_file(source_file = 'sample1.xml', output_file = 'chaining-result1.xml')

Many thanks for swift and helpful response! I can confirm that your first suggested work around above works fine (If I need the intermediate results for debugging, it's easy enough to write them to file)

It would be nice to know why my original simple-minded attempt did not work though

Lou Burnard wrote in #note-6:

It would be nice to know why my original simple-minded attempt did not work though

I hope O'Neil investigates that during the week and let's you know.

Hi,

In the original example for the first time around the loop what is the value of the variable FILE?