ASCII-based standard character encodings for Arabic
ISO-8859-6 (ASMO 708)
MIME / IANA
| ISO-8859-6
|
---|
Alias(es)
| iso-ir-127, ECMA-114, ASMO-708, arabic, csISOLatinArabic
[1]
|
---|
Standard
| ASMO 708, ECMA-114, ISO/IEC 8859-6
|
---|
Classification
| extended ASCII
,
ISO 8859
|
---|
Extensions
| OEM-708
,
Mac OS Arabic
(almost)
|
---|
Preceded by
| ASMO 449
|
---|
Other related encoding(s)
| Windows-1256
(incompatible, moves several letters)
|
---|
|
ISO/IEC 8859-6:1999
,
Information technology ? 8-bit single-byte coded graphic character sets ? Part 6: Latin/Arabic alphabet
, is part of the
ISO/IEC 8859
series of ASCII-based standard
character encodings
, first edition published in 1987. It is informally referred to as
Latin/Arabic
. It was designed to cover
Arabic
. Only nominal letters are encoded, no preshaped forms of the letters, so shaping processing is required for display. It does not include the extra letters needed to write most Arabic-script languages other than Arabic itself (such as Persian, Urdu, etc.).
ISO-8859-6
is the
IANA
preferred charset name for this standard when supplemented with the
C0 and C1 control codes
from
ISO/IEC 6429
. The text is in logical order, so
BiDi
processing is required for display. Nominally
ISO-8859-6
(
code page 28596
) is for "visual order", and
ISO-8859-6-I
(
code page 38596
) is for logical order. But in practice, and required for HTML and XML documents,
ISO-8859-6
also stands for logical order text. There is also
ISO-8859-6-E
which supposedly requires directionality to be explicitly specified with special control characters; this latter variant is in practice unused. IBM has assigned
code page/
CCSID
1089
to ISO 8859-6.
[2]
[3]
It is an emulation for their
AIX
operating system.
ISO-8859-6 is now
technologically obsolete
,
[4]
and
Unicode
is preferred in modern applications, especially on the Internet; meaning the dominant
UTF-8
encoding for web pages (see also
Arabic script in Unicode
, for complete coverage, unlike for e.g. ISO-8859-6 or
Windows 1256
that do not cover extras). Less than 0.0002% of all web pages use ISO-8859-6,
[5]
[6]
and it is not even the third-most popular encoding option for Arabic on the web.
History
[
edit
]
ASMO 708 was devised by the now defunct
Arab Standardization and Metrology Organization
[7]
in 1986 to be the 8-bit standard to be used in Arabic-speaking countries. The design of this character set was inspired by the previous 7-bit standard ?
ASMO 449
? but it is not simply the 7-bit character set moved to the upper part; there are some differences.
ASMO 708 is a
bidirectional
character set. The lower part of the character set differs from standard
ISO 646
in the digits and in some punctuation. Depending on the context (whether the numbers are within Latin script or Arabic script), the digits are rendered either as Latin digits or Arabic digits. Also, depending on the context, symmetrical punctuation marks are reversed, i.e., whenever there is an opening punctuation mark, the shape is rendered differently according to the direction of the script.
The upper part of the character set has only the Arabic letters, Arabic punctuation that is different from Latin punctuation, plus few other characters.
ASMO 708 was designed in close cooperation
[8]
with
ECMA
, which adopted it as its own
ECMA-114
standard in 1986. It was also approved as an
ISO standard
as
ISO 8859-6
.
[9]
It was also registered in the
International Register of Coded Character Sets
as
IR 127
[10]
in 1986.
Relationship with other character sets
[
edit
]
Some other character sets are related to ASMO 708:
- ASMO 708/French 1
[11]
adds French lower case characters;
- French 1/ASMO 708
[11]
adds French lower case characters in their ISO 8859-1 code points and
dislocates
the Arabic ones;
- ISO/IR 167
[12]
adds French and German characters;
- Microsoft’s
code page 708
, for MS-DOS, adds French characters in their typical code points from code page 437 and adds box-drawing characters;
- Both Microsoft’s code page 710 (Transparent Arabic) and Microsoft’s
code page 720
(Transparent ASMO), for MS-DOS, add French characters in their typical code points from code page 437 but
dislocates
the Arabic characters to allow the box-drawing characters from code page 437 to be in their original code points;
- Microsoft’s
Windows 1256
adds French lower case characters in their
Windows 1252
code points and
dislocates
the Arabic ones;
Code chart
[
edit
]
Code values 0xEB–0xF2 are assigned to
combining characters
.
See also
[
edit
]
References
[
edit
]
- ^
Character Sets
,
Internet Assigned Numbers Authority
(IANA), 2018-12-12
- ^
"Code page 1089 information document"
. Archived from
the original
on 2016-03-17.
- ^
"CCSID 1089 information document"
. Archived from
the original
on 2016-03-27.
- ^
Computing and the Qur??n - Some caveats, 2007, Thomas Milo
- ^
"Usage Statistics of ISO-8859-6 for Websites, October 2022"
.
w3techs.com
. Retrieved
2022-10-25
.
- ^
"Frequenty Asked Questions"
.
- ^
Le codage informatique de l’ecriture arabe : d’ASMO 449 a Unicode et ISO/CEI 10646
- ^
Standard ECMA-114
- ^
ISO/IEC 8859-6:1999
- ^
European Computer Manufacturers Association
,
Arabic Organization for Standardization and Metrology
(1986-11-30).
Right-Hand Part of Latin/Arabic Alphabet
(PDF)
. ITSCJ/
IPSJ
.
ISO-IR
-127.
- ^
a
b
Printronix ACA Emulation Programmer’s Reference Manual
- ^
European Computer Manufacturers Association (1992-07-12).
Arabic/French/German Set
(PDF)
. ITSCJ/
IPSJ
.
ISO-IR
-167.
- ^
"ISO 8859-6:1999 to Unicode"
. 1999-07-27.
- ^
Code Page CPGID 01089 (pdf)
(PDF)
, IBM
- ^
Code Page CPGID 01089 (txt)
, IBM
- ^
International Components for Unicode (ICU), ibm-1089_P100-1995.ucm
, 2002-12-03
External links
[
edit
]