@jeffrysteele - I tried importing your xml file into Dorico 4, Dorico 5, MuseScore 4 and Sibelius.
Dorico 4 and Dorico 5 both gave the same error messages:
MusicXML validation failed
When I clicked on Show Details…
ERROR - Element ‘other-notation’: This element is not expected.
At line 3517 of /Users/steven/Desktop/BWV_1009_8-str_gtr.xml
15 bars were imported
Sibelius Ultimate (the latest version) reported:
This is not a MusicXML file and cannot be loaded: Element other-notation is not defined in this scope.
It tried to import anyway, but nothing had happened after about 5 minutes so I cancelled.
MuseScore 4 reported:
File /Users/steven/Desktop/BWV_1009_8-str_gtr.xml is not a valid MusicXML file
Do you want to try to load this file anyway?
When I clicked on Show Details…
Fatal error: line 3517, column 65: Element other-notation is not defined in this scope.
When I clicked on Yes:
It imported 108 bars of music.
I then exported it as MusicXML.
(I have zipped it here as the forum would not accept it with its original file type)
BWV_1009_8-str_gtr (from MS4).musicxml.zip (58.8 KB)
This file (once it was unzipped) imported into Dorico without any problems.
In your original MusicXML file, all the occurrences of other-notation look like:
or
I don’t know if simply editing out those lines (8 in total) will fix the problem without introducing others, but in the MusicXML file exported from MuseScore 4 those lines are not present.
EDIT:
Here is your original file with those “other-notation” lines edited out.
It imported into Dorico without giving any error messages.
It is possible that anything related to the strings referenced, such as fingering, might be affected.
BWV_1009_8-str_gtr edited.xml (1.7 MB)