(Footnote 1) Believe there is a typo in the footnote which is causing some confusion. See summary for details.

It is unclear whether this is intended to indicate the month of May or that the codes systems may include … Text should be clarified. If it's to indicate the content may include, then remove the 's' from the word includes or consider using different language like 'can include' or 'could include' or 'might contain' etc.

Existing Wording:

May includes DEQM defined code systems and externally defined code systems