XMLSyntaxError during conversion to XML output

[fortyfourforty]

Error url: https://www.tristatetelecom.com/productdetailI2.aspx?dataid=IPGSM-4G

Error:

Traceback (most recent call last):

File "/usr/local/lib/python3.10/dist-packages/IPython/core/interactiveshell.py", line 3553, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)

File "", line 2, in <cell line: 2>
content_source1 = trafilatura.extract(ssss, output_format='xml', include_comments=False)

File "/usr/local/lib/python3.10/dist-packages/trafilatura/core.py", line 1091, in extract
return determine_returnstring(document, output_format, include_formatting, tei_validation)

File "/usr/local/lib/python3.10/dist-packages/trafilatura/core.py", line 788, in determine_returnstring
returnstring = control_xml_output(output, output_format, tei_validation, document)

File "/usr/local/lib/python3.10/dist-packages/trafilatura/xml.py", line 106, in control_xml_output
output_tree = fromstring(control_string, CONTROL_PARSER)

File "src/lxml/etree.pyx", line 3257, in lxml.etree.fromstring

File "src/lxml/parser.pxi", line 1916, in lxml.etree._parseMemoryDocument

File "src/lxml/parser.pxi", line 1796, in lxml.etree._parseDoc

File "src/lxml/parser.pxi", line 1085, in lxml.etree._BaseParser._parseUnicodeDoc

File "src/lxml/parser.pxi", line 618, in lxml.etree._ParserContext._handleParseResultDoc

File "src/lxml/parser.pxi", line 728, in lxml.etree._handleParseResult

File "src/lxml/parser.pxi", line 657, in lxml.etree._raiseParseError

File "", line 2
XMLSyntaxError: Failed to parse QName 'padding:', line 2, column 480

Function: trafilatura.extract(source, output_format='xml', include_comments=False)

[adbar]

I can reproduce the bug, it only happens when the output is set to XML.

trafilatura -u "https://www.tristatetelecom.com/productdetailI2.aspx?dataid=IPGSM-4G" -vv --xml

URL saved for to reproduce it later: https://web.archive.org/web/20230619162141/https://www.tristatetelecom.com/productdetailI2.aspx?dataid=IPGSM-4G

[vbarbaresi]

I extracted a minimal reproducing example

echo 'Testing<ul style="" padding:1px; margin:15px""><b>Features:</b> <li>Saves the cost of two dedicated phone lines.</li> al station using Internet or cellular technology.</li> <li>Requires no change to the existing Fire Alarm Control Panel configuration. The IPGSM-4G connects directly to the primary and secondary telephone ports.</li>
' | trafilatura --xml

We need a long enough element not to be dropped, and then padding:1px; margin:15px are invalid attributes: the : symbol prefix doesn't match any XML namespace.

I proposed a fix in #462