L2/05-083 Source: Mark Davis Date: March 25, 2005 Subject: Word-Related Properties 1. I propose that we add a property that identifies characters that may be allowed in an extension of identifers in circumstances where the identifiers are expected to encompass words used in natural languages. It would be expected that people restrict this according to their particular situation. This property can be documented in UAX #31, and reference it in #29. Here is my draft of the contents. 0027 ; Word_Extension Word_Extension # Po APOSTROPHE 002D ; Word_Extension Word_Extension # Pd HYPHEN-MINUS 002E ; Word_Extension Word_Extension # Po FULL STOP 003A ; Word_Extension Word_Extension # Po COLON 00B7 ; Word_Extension Word_Extension # Po MIDDLE DOT 058A ; Word_Extension Word_Extension # Pd ARMENIAN HYPHEN 05F3 ; Word_Extension Word_Extension # Po HEBREW PUNCTUATION GERESH 05F4 ; Word_Extension Word_Extension # Po HEBREW PUNCTUATION GERSHAYIM 200C ; Word_Extension # Cf ZERO WIDTH NON-JOINER // for Indic? 200D ; Word_Extension # Cf ZERO WIDTH JOINER // for Indic? 2010 ; Word_Extension # HYPHEN 2019 ; Word_Extension # Pf RIGHT SINGLE QUOTATION MARK 2027 ; Word_Extension # Po HYPHENATION POINT 30A0 ; Word_Extension # Pd KATAKANA-HIRAGANA DOUBLE HYPHEN 2. The following characters are not part of Alphabetic, despite being Modifier Letters (at least according to their names). Either they should be added, or we should document what the situation is: 02C2 # Sk MODIFIER LETTER LEFT ARROWHEAD 02C3 # Sk MODIFIER LETTER RIGHT ARROWHEAD 02C4 # Sk MODIFIER LETTER UP ARROWHEAD 02C5 # Sk MODIFIER LETTER DOWN ARROWHEAD 02D2 # Sk MODIFIER LETTER CENTRED RIGHT HALF RING 02D3 # Sk MODIFIER LETTER CENTRED LEFT HALF RING 02D4 # Sk MODIFIER LETTER UP TACK 02D5 # Sk MODIFIER LETTER DOWN TACK 02D6 # Sk MODIFIER LETTER PLUS SIGN 02D7 # Sk MODIFIER LETTER MINUS SIGN 02DE # Sk MODIFIER LETTER RHOTIC HOOK 02DF # Sk MODIFIER LETTER CROSS ACCENT 02E5 # Sk MODIFIER LETTER EXTRA-HIGH TONE BAR 02E6 # Sk MODIFIER LETTER HIGH TONE BAR 02E7 # Sk MODIFIER LETTER MID TONE BAR 02E8 # Sk MODIFIER LETTER LOW TONE BAR 02E9 # Sk MODIFIER LETTER EXTRA-LOW TONE BAR 02EA # Sk MODIFIER LETTER YIN DEPARTING TONE MARK 02EB # Sk MODIFIER LETTER YANG DEPARTING TONE MARK 02EC # Sk MODIFIER LETTER VOICING 02ED # Sk MODIFIER LETTER UNASPIRATED 02EF # Sk MODIFIER LETTER LOW DOWN ARROWHEAD 02F0 # Sk MODIFIER LETTER LOW UP ARROWHEAD 02F1 # Sk MODIFIER LETTER LOW LEFT ARROWHEAD 02F2 # Sk MODIFIER LETTER LOW RIGHT ARROWHEAD 02F3 # Sk MODIFIER LETTER LOW RING 02F4 # Sk MODIFIER LETTER MIDDLE GRAVE ACCENT 02F5 # Sk MODIFIER LETTER MIDDLE DOUBLE GRAVE ACCENT 02F6 # Sk MODIFIER LETTER MIDDLE DOUBLE ACUTE ACCENT 02F7 # Sk MODIFIER LETTER LOW TILDE 02F8 # Sk MODIFIER LETTER RAISED COLON 02F9 # Sk MODIFIER LETTER BEGIN HIGH TONE 02FA # Sk MODIFIER LETTER END HIGH TONE 02FB # Sk MODIFIER LETTER BEGIN LOW TONE 02FC # Sk MODIFIER LETTER END LOW TONE 02FD # Sk MODIFIER LETTER SHELF 02FE # Sk MODIFIER LETTER OPEN SHELF 02FF # Sk MODIFIER LETTER LOW LEFT ARROW A700 # Sk MODIFIER LETTER CHINESE TONE YIN PING A701 # Sk MODIFIER LETTER CHINESE TONE YANG PING A702 # Sk MODIFIER LETTER CHINESE TONE YIN SHANG A703 # Sk MODIFIER LETTER CHINESE TONE YANG SHANG A704 # Sk MODIFIER LETTER CHINESE TONE YIN QU A705 # Sk MODIFIER LETTER CHINESE TONE YANG QU A706 # Sk MODIFIER LETTER CHINESE TONE YIN RU A707 # Sk MODIFIER LETTER CHINESE TONE YANG RU A708 # Sk MODIFIER LETTER EXTRA-HIGH DOTTED TONE BAR A709 # Sk MODIFIER LETTER HIGH DOTTED TONE BAR A70A # Sk MODIFIER LETTER MID DOTTED TONE BAR A70B # Sk MODIFIER LETTER LOW DOTTED TONE BAR A70C # Sk MODIFIER LETTER EXTRA-LOW DOTTED TONE BAR A70D # Sk MODIFIER LETTER EXTRA-HIGH DOTTED LEFT-STEM TONE BAR A70E # Sk MODIFIER LETTER HIGH DOTTED LEFT-STEM TONE BAR A70F # Sk MODIFIER LETTER MID DOTTED LEFT-STEM TONE BAR A710 # Sk MODIFIER LETTER LOW DOTTED LEFT-STEM TONE BAR A711 # Sk MODIFIER LETTER EXTRA-LOW DOTTED LEFT-STEM TONE BAR A712 # Sk MODIFIER LETTER EXTRA-HIGH LEFT-STEM TONE BAR A713 # Sk MODIFIER LETTER HIGH LEFT-STEM TONE BAR A714 # Sk MODIFIER LETTER MID LEFT-STEM TONE BAR A715 # Sk MODIFIER LETTER LOW LEFT-STEM TONE BAR A716 # Sk MODIFIER LETTER EXTRA-LOW LEFT-STEM TONE BAR There are a few other Symbol characters with "LETTER" in their names that are not Alphabetic. I mention them only for comparison. 2129 # So TURNED GREEK SMALL LETTER IOTA 249C..24B5 # So PARENTHESIZED LATIN SMALL LETTER A .. PARENTHESIZED LATIN SMALL LETTER Z FB29 # Sm HEBREW LETTER ALTERNATIVE PLUS SIGN