Therefore diacritic marks
are omitted, when the keywords are sought in the student's answer, the difference between characters "i" and "y" is ignored as well.
Finally, early versions of Blackboard do not support use of diacritic marks
and non-Roman writing systems except in posted documents--a problem if languages other than English need to be used for Announcements, Discussion Board etc.
A special requirements was the need for the network and its terminal equipment to support the American Library Association (ALA) ASCII character set which incorporates diacritic marks
and other special symbols used when cataloging library materials.
The challenge for the OCR engine when recognizing Arabic text is discriminating between diacritic marks
and `noise' on a scanned page, isolating individual characters in the script-like Arabic text, and identifying Arabic characters that frequently change shape depending on the location of the character in a word.
Using a Macintosh computer, the author prepared camera-ready copy with all the necessary diacritic marks
in addition to Chinese characters.