xml standard symbol notation, "-" meaning

I try understand XML definition, but stuck on 'CharData' token. It's taken from http://ift.tt/1vesrqu. From regural expression I know that "-" is used for range, but don't get it in this case. Can somebody please explain me what is meaning of this expressions?

[14]    CharData       ::=      [^<&]* - ([^<&]* ']]>' [^<&]*)
[15]    Comment    ::=      '<!--' ((Char - '-') | ('-' (Char - '-')))* '-->'

Thanks.