Maxlength specifies a maximum on the number of characters allowed in the answer blank. Unless specifically restricted, there is no limit. The spacing must be identical to that supplied by the author. Accents specifies punctuation characters that should be considered as alphabetic, so that they are not ignored when punctuation is ignored. There is no feedback message.
Medium feedback is the same as low unless ccase, punc, or spacing is checked.
In addition, if the student's answer is not completely correct, then the correct answer is explicitly specified in the feedback messages.