plistlib / xml file / get value except key

[Tecuma]

When I add this code with fmt I got

Error:
python3 helper_plist-xml_2.py 
File:  Bookmarks_example.xml
 
Traceback (most recent call last):
  File "/home/wchris/Python/helper_plist-xml_2.py", line 8, in <module>
    pl = plistlib.load(fp, fmt="FMT_XML")
  File "/usr/lib/python3.9/plistlib.py", line 872, in load
    P = _FORMATS[fmt]['parser']
KeyError: 'FMT_XML'