Uknown pname values in several MEI files

There are 118 MEI files with unknown symbols such as '.', '?', and '>>' instead of valid note names in the pname attribute. It would be great if the documentation could have a conversion dictionary so these values could be interpreted accurately.

You can find the relative path of all MEI files with unkown symbols by searching through this link with the keyword "pname":

https://github.com/DDMAL/MEI2Volpiano/blob/dev/resources/andrew_hughes_data/converted.txt

Note: You can find notes with no syllable attached to them at the end of MEI files by searching "syllable-independent" in the same file. Some MEI files have both unknown symbols and independent notes.