ISO/IEC JTC1/SC22/WG20 N227

	Recommendation on the extended use of characters in identifiers

	1. Introduction

	Traditionally programming languages allow identifiers with the
	repertoire of the latin nonaccented upper and lower case letters
	in identifiers, plus digits and some other characters according
	to the rules of the different programming languages.

	It has been requested by a substantial number of member bodies
	to enhance the allowed repertoire of what can be considered as
	'letters' in identifiers, to allow users to write more
	meaningful programs using words from their native language. It
	has thus been recommended by a number of SC22 ad hoc groups to
	provide such functionality, and this is also recommended by
	WG20.

	2. Recommendation

	It is recommended that programming languages allow characters
	outside the repertoire of the latin nonaccented upper and lower
	case letters in identifiers. The repertoire recommended consists
	of characters that are used to write words of different
	languages of the world, called "scriptic" characters.

	Attention is drawn to that using extended repertoire for
	identifiers may impact source code portability. It is reasonable
	to assume that there exists work-arounds to this problem.

	The provisionally recommended characters consists of the
	following ISO/IEC 10646-1:1993 level 1 characters, given as
	their code points in UCS-2:

	Latin:
	0041-005a,0061-007a,00c0-00d6,00d8-00f6,00f8-01f5,01fa-0217,
	0250-02a8,1e00-1e9a,1ea0-1ef9
	Greek:
	0384-038a,038c,038e-03a1,03a3-03ce,03d0-03d6,03da,03dc,03de,
	03e0,03e2-03f3,1f00-1f15,1f18-1f1d,1f20-1f45,1f48-1f4d,1f50-1f57,
	1f59,1f5b,1f5d,1f5f-1f7d,1f80-1fb4,1fb6-1fbc,1fc2-1fc4,1fc6-1fcc,
	1fd0-1fd3,1fd6-1fdb,1fe0-1fec,1ff2-1ff4,1ff6-1ffc,
	Cyrilic:
	0401-040d,040f-044f,0451-045c,045e-0481,0490-04c4,04c7-04c8,
	04cb-04cc,04d0-04eb, 04ee-04f5,04f8-04f9
	Armenian:
	0531-0556,0561-0587
	Hebrew: 05d0-05ea,05f0-05f4
	Arabic:
	0621-063a,0640-0652,0670-06b7,06ba-06ba-06be,06c0-06ce,06e5-06e7,
	Devanagari:
	0905-0939,0958-0962
	Bengali:
	0985-098c,098f-0990,0993-09a8,09aa-09b0,09b2,09b6-09b9,
	09dc-09dd,09df-09e1,09f0-09f1
	Gurmukhi:
	0a05-0a0a,0a0f-0a10,0a13-0a28,0a2a-0a30,0a32-0a33,
	0a35-0a36,0a38-0a39,0a59-0a5c,0a5e
	Gujarati:
	0a85-0a8b,0a8d,0a8f-0a91,0a93-0aa8,0aaa-0ab0,0ab2-0ab3,0ab5-0ab9,
	0ae0,
	Oriya:
	0b05-0b0c,0b0f-0b10,0b13-0b28,0b2a-0b30,0b32-0b33,0b36-0b39,
	0b5c-0b5d,0b5f-0b61,
	Tamil:
	0b85-0b8a,0b8e-0b90,0b92-0b95,0b99-0b9a,0b9c,0b9e-0b9f,0ba3-0ba4,
	0ba8-0baa,0bae-0bb5,0bb7-0bb9,
	Telugu:
	0c05-0c0c,0c0e-0c10,0c12-0c28,0c2a-0c33,0c35-0c39,0c60-0c61,
	Kannada:
	0c85-0c8c,0c8e-0c90,0c92-0ca8,0caa-0cb3,0cb5-0cb9,0ce0-0ce1,
	Malayalam:
	0d05-0d0c,0d0e-0d10,0d12-0d28,0d2a-0d39,0d60-0d61,
	Thai:
	0e01-0e30,0e32-0e33,0e40-0e46,0e4f,035a-0e5b,
	Lao:
	0e81-0e82,0e84,0e87,0e88,0e8a,0e0d,0e94-0e97,0e99-0e9f,0ea1-0ea3,
	0ea5,0ea7,0eaa,0eab,0ead-0eb0,0eb2,0eb3,0ebd,0ec0-0ec4,0ec6,
	Georgian:
	10a0-10c5,10d0-10f6,
	Hangul Jamo:
	3131-318e,3400-4dff
	Hiragana:
	3041-3094,309b-309e
	Katakana:
	30a1-30fe,
	bopmofo:
	3105-312c,
	hangul:
	1100-1159,1161-11a2,11a8-11f9
	Han:
	f900-fa2d,fb1f-fb36,fb38-fb3c,fb3e,fb40-fb41,fb42-fb44,fb46-fbb1,
	fbd3-fd3f,fd50-fd8f,fd92-fdc7,fdf0-fdfb,fe70-fe72,fe74,5e76-fefc,
	ff21-ff3a,ff41-ff5a,ff66-ffbe,ffc2-ffc7,ffca-ffcf,ffd2-ffd7,
	ffda-ffdc,4e00-9fa5