Just found saxonche library for python. Which is great. While playing around I encountered following issue:
When trying to use executable.transform_to_value to return a PyXdmNode, the code below produces None.
input xml:
<document>
<a>123456</a>
</document>
xslt:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<root>
<b>
<xsl:value-of select="document/a"/>
</b>
</root>
</xsl:template>
</xsl:stylesheet>
python3.8.10:
from saxonche import PySaxonProcessor
input_xml ="examples/input.xml"
stylesheet = "examples/test.xslt"
proc = PySaxonProcessor(license=False)
xsltproc = proc.new_xslt30_processor()
input_xdm = proc.parse_xml(xml_file_name=input_xml)
print(type(input_xdm))
print("--------------")
stylesheet_xdm = proc.parse_xml(xml_file_name=stylesheet)
print(type(stylesheet_xdm))
print("==============")
executable = xsltproc.compile_stylesheet(stylesheet_node=stylesheet_xdm)
# produces None (what I'm doing wrong?)
result_xdm = executable.transform_to_value(xdm_node=input_xdm)
print(type(result_xdm))
print(result_xdm)
print("--------------")
#produces string (as expected)
result_str = executable.transform_to_string(xdm_node=input_xdm)
print(type(result_str))
print(result_str)
output:
python3 test_xslt_xdm_node.py
<class 'saxonche.PyXdmNode'>
--------------
<class 'saxonche.PyXdmNode'>
==============
<class 'NoneType'>
None
--------------
<class 'str'>
<?xml version="1.0" encoding="UTF-8"?><root><b>123456</b></root>
As you can see, I did try to transform to string and it works as expected. Does anybody have an idea what I'm doing wrong?
That seems a bug in SaxonC (filed as https://saxonica.plan.io/issues/6334), I suggest you change the Python code to
result_xdm = executable.apply_templates_returning_value(xdm_value=input_xdm)
print(type(result_xdm))
print(result_xdm)
as a workaround.