This MOF Format Specification is riddled with C-style ("//") comments but the the allowed structure of actual MOF file comments are not shown in the BNF (which uses BNF improperly, IMO: "aliasIdentifer = "$" IDENTIFIER // NO whitespace !").
I have found many examples of MOF files that use:
/* comments */
// comment
But these were not in the context of defining the MOF format itself.