Python Exception: URL misses Ampersand when adding multiple features

[Erkan70]

When I add below Inspire Harmonised WFS service I run into a Python error. The URL seems to use Comma's instead of Ampersands for the TypeNames.

https://geodata.nationaalgeoregister.nl/inspire/tn-a/wfs?service=WFS&v
ersion=2.0.0&request=GetFeature&typenames=tn-a%3AAerodromeArea%2Ctn-a%
3AAerodromeNode%2Ctn-a%3AElementWidth%2Ctn-a%3ARunwayArea%2Ctn-a%3ATax
iwayArea%2Ctn-a%3ATouchDownLiftOff

Error log:
Er is een fout opgetreden bij het uitvoeren van Python code:

requests.exceptions.HTTPError: 500 Server Error: for url: https://geodata.nationaalgeoregister.nl/inspire/tn-a/wfs?service=WFS&version=2.0.0&request=GetFeature&typenames=tn-a%3AAerodromeArea%2Ctn-a%3AAerodromeNode%2Ctn-a%3AElementWidth%2Ctn-a%3ARunwayArea%2Ctn-a%3ATaxiwayArea%2Ctn-a%3ATouchDownLiftOff
Traceback (most recent call last):
File "C:/Users/EfekErkan/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gml_application_schema_toolbox\gui\load_wizard_xml.py", line 36, in validatePage
gml_path = self.wizard().gml_path()
File "C:/Users/EfekErkan/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gml_application_schema_toolbox\gui\load_wizard.py", line 181, in gml_path
self._wfs_page.download(gml_path)
File "C:/Users/EfekErkan/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gml_application_schema_toolbox\gui\load_wizard_wfs.py", line 227, in download
self.download_features(output_path)
File "C:/Users/EfekErkan/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gml_application_schema_toolbox\gui\load_wizard_wfs.py", line 260, in download_features
response = wfs.getfeature(**params)
File "C:\PROGRA1\QGIS31.6\apps\Python37\lib\site-packages\owslib\feature\wfs200.py", line 232, in getfeature
username=self.username, password=self.password)
File "C:\PROGRA1\QGIS31.6\apps\Python37\lib\site-packages\owslib\util.py", line 196, in openURL
req.raise_for_status()
File "C:\PROGRA1\QGIS31.6\apps\Python37\lib\site-packages\requests\models.py", line 939, in raise_for_status
raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 500 Server Error: for url: https://geodata.nationaalgeoregister.nl/inspire/tn-a/wfs?service=WFS&version=2.0.0&request=GetFeature&typenames=tn-a%3AAerodromeArea%2Ctn-a%3AAerodromeNode%2Ctn-a%3AElementWidth%2Ctn-a%3ARunwayArea%2Ctn-a%3ATaxiwayArea%2Ctn-a%3ATouchDownLiftOff

Python versie: 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)]
QGIS versie: 3.6.2-Noosa Noosa, 656500e0c4

Python pad:
C:/Users/EfekErkan/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\gml_application_schema_toolbox\extlibs
C:/PROGRA1/QGIS31.6/apps/qgis/./python
C:/Users/EfekErkan/AppData/Roaming/QGIS/QGIS3\profiles\default/python
C:/Users/EfekErkan/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins
C:/PROGRA1/QGIS31.6/apps/qgis/./python/plugins
C:\Program Files\QGIS 3.6\bin\python37.zip
C:\PROGRA1\QGIS31.6\apps\Python37\DLLs
C:\PROGRA1\QGIS31.6\apps\Python37\lib
C:\Program Files\QGIS 3.6\bin
C:\PROGRA1\QGIS31.6\apps\Python37
C:\PROGRA1\QGIS31.6\apps\Python37\lib\site-packages
C:\PROGRA1\QGIS31.6\apps\Python37\lib\site-packages\win32
C:\PROGRA1\QGIS31.6\apps\Python37\lib\site-packages\win32\lib
C:\PROGRA1\QGIS31.6\apps\Python37\lib\site-packages\Pythonwin
C:/Users/EfekErkan/AppData/Roaming/QGIS/QGIS3\profiles\default/python

[nmtoken]

URL seems to use Comma's instead of Ampersands for the TypeNames.

Comma separator is correct syntax, for a list of type names. WFS 2.0 follows OGC 09-026r2, 5.5

Parameters consisting of lists shall use the comma (",") as the delimiter between items in the list. In addition, multiple lists may be specified as the value of a parameter by enclosing each list in parentheses; "(",")".

EXAMPLE 1 This example shows a list of items.

PARAMETER=item1,item2,item3,item4a%2Citem4b

...