Mordant Specification Inconsistancy

Dear All, 

I've just found an inconsistency in the documentation regarding to the mordent element and any kind of help would be appreciated.
If you please look at the SMuFL specification: https://w3c.github.io/smufl/gitbook/tables/common-ornaments.html <https://w3c.github.io/smufl/gitbook/tables/common-ornaments.html> chapter 4.46,
you will see the mordent glyph is the one without vertical line, whereas the inverted-mordent has the line.
If you now take a look at the musicXML documentation: http://usermanuals.musicxml.com/MusicXML/MusicXML.htm#EL-MusicXML-mordent.htm#kanchor1196 <http://usermanuals.musicxml.com/MusicXML/MusicXML.htm#EL-MusicXML-mordent..htm%23kanchor1196>, you will see the exact opposite. The mordent has a vertical line and the inverted-mordent doesn’t. 
I performed some quick web searches and it appears that the meaning of the mordent has changed during the history, therefore I can’t decide for myself which is the good one.

So does anybody please tell me more about that, or do I miss something ? 
Best regards.

Baur Aymeric
QA engineer at neoScores.