ISO 8859

ISO 8859, more formally ISO/IEC 8859, is a joint ISO and IEC standard for 8-bit character encodings for use by computers. The standard is divided into numbered, separately published parts, such as ISO/IEC 8859-1, ISO/IEC 8859-2, etc., each of which may be informally referred to as a standard in and of itself. There are currently 15 parts.

Contents

Introduction

While the bit patterns of the 96 printable ASCII characters are sufficient to exchange information in modern English, most other languages that use the Roman alphabet need additional symbols not covered by ASCII, such as ß (German) and å (Swedish and other Nordic languages). ISO 8859 sought to remedy this problem by utilizing the eighth bit in an 8-bit byte in order to allow positions for another 128 characters. (This bit was previously used for data transmission protocol information, or was left unused.) However, more characters were needed than could fit in a single 8-bit character encoding, so several mappings were developed, including at least 10 just to cover the Latin script.

Although ISO 8859-n and ISO-8859-n are terms often used interchangeably, the ISO 8859 standard is not the same as the well-known ISO-8859-n character encodings approved by the IANA for use on the Internet. Besides the extra hyphen being present in the IANA-approved names, the encodings differ in that each part of the ISO standard assigns, at most, 191 characters to the byte ranges 32 to 126 and 160 to 255, whereas the corresponding IANA-approved character encoding merges these mappings with the C0 control set (control characters mapped to bytes 0 to 31) and the C1 control set (control characters mapped to bytes 127 to 159), resulting in a full 8-bit character map with most, if not all, bytes assigned.

Characters

The ISO 8859 standard is designed for reliable information exchange, not typography; the standard omits symbols needed for high-quality typography, such as optional ligatures, curly quotation marks, dashes, etc. As a result, high-quality typesetting systems often use proprietary or idiosyncratic extensions on top of the ASCII and ISO 8859 standards, or use Unicode instead.

As a rule of thumb, if a character or symbol was not already part of a widely used data-processing character set and was also not usually provided on typewriter keyboards for a national language, it didn't get in. Hence the directional double quotation marks « and » used for some European languages were included, but not the directional double quotation marks and used for English and some other languages. French didn't get its œ and Œ ligatures because they could be typed as 'oe'. Ÿ, needed for all-caps text, was left out as well. These characters were, however, included later with ISO 8859-15, which also introduced the new Euro character . Likewise Dutch did not get the 'ij' and 'IJ' letters, because Dutch speakers had gotten used to typing these as two letters instead. Romanian did not initially get its 'Template:Unicode' and 'Template:Unicode' (with comma) letters, because these letters were initially unified with 'Ş/ş' and 'Ţ/ţ' (with cedilla) by the Unicode Consortium, considering the shapes with comma beneath to be glyph variants of the shapes with cedilla. However, the letters with explicit comma below were later added to the Unicode standard and are also in ISO 8859-16.

Most of the ISO 8859 encodings provide diacritic marks required for various European languages. Others provide non-Roman alphabets: Greek, Cyrillic, Hebrew, Arabic and Thai. However, the standard makes no provision for the scripts of East Asian languages (CJK), as their ideographic writing systems require many thousands of code points. Although it uses Latin based characters, Vietnamese does not fit into 96 positions either; Japanese syllabic Kana scripts, on the other hand, might, but like several other alphabets of the world isn't encoded in the ISO 8859 system.

The Parts of ISO 8859

ISO 8859 is divided into the following parts:

ISO 8859-1 Latin-1
Western European
Perhaps the most widely used part of ISO 8859, covering most Western European languages: Basque, Catalan, Danish, Dutch (partial[1]), English, Faeroese, Finnish (partial²), French (partial[2]), German, Icelandic, Irish, Italian, Norwegian, Portuguese, Rhaeto-Romanic, Scottish, Spanish, and Swedish, Eastern European Albanian, as well as the African languages Afrikaans and Swahili. The missing Euro symbol and capital Ÿ are in the revised version ISO 8859-15. The corresponding IANA-approved character set ISO-8859-1 is the default encoding for legacy HTML documents and for documents transmitted via MIME messages, such as HTTP responses when the document's media type is "text" (as in "text/html").
ISO 8859-2 Latin-2
Central European
supports those Central and Eastern European languages that use a Roman alphabet, including Polish, Croatian, Czech, Slovak, Slovenian, and Hungarian. The missing Euro symbol can be found in version ISO 8859-16.
ISO 8859-3 Latin-3
South European
Turkish, Maltese, and Esperanto; largely superseded by ISO 8859-9 for Turkish and Unicode for Esperanto.
ISO 8859-4 Latin-4
North European
Estonian, Latvian, Lithuanian, Greenlandic, and Sami.
ISO 8859-5 Cyrillic Covers mostly Slavic languages that use a Cyrillic alphabet, including Belarusian, Bulgarian, Macedonian, Russian, Serbian, and Ukrainian (partial[3]).
ISO 8859-6 Arabic Covers the most common Arabic language characters. Doesn't support other languages using the Arabic script.
ISO 8859-7 Greek Covers the modern Greek language (monotonic orthography). Can also be used for Ancient Greek written without accents or in monotonic orthography, but lacks the diacritics for polytonic orthography. These were introduced with Unicode.
ISO 8859-8 Hebrew Covers the modern Hebrew alphabet as used in Israel. In practice two different encodings exist, logical and visual.
ISO 8859-9 Latin-5
Turkish
Largely the same as ISO 8859-1, replacing the rarely used Icelandic letters with Turkish ones. It is also used for Kurdish.
ISO 8859-10 Latin-6
Nordic
a rearrangement of Latin-4. Considered more useful for Nordic languages. Baltic languages use Latin-4 more.
ISO 8859-11 Thai Contains most glyphs needed for the Thai language.
ISO 8859-12   was supposed to be Latin-7 and cover Celtic, but this draft was rejected. Numbering continued with -13.
ISO 8859-13 Latin-7
Baltic Rim
Added some glyphs for Baltic languages which were missing from Latin-4 and Latin-6.
ISO 8859-14 Latin-8
Celtic
Mostly a rearrangement of the ISO 8859-12 draft. Covers Celtic languages such as Gaelic and the Breton language.
ISO 8859-15 Latin-9 a revision of 8859-1 that removes some little-used symbols, replacing them with the Euro symbol and the letters Š, š, Ž, ž, Œ, œ, and Ÿ, which completes the coverage of French, Finnish and Estonian.
ISO 8859-16 Latin-10
South-Eastern European
Intended for Albanian, Croatian, Hungarian, Italian, Polish, Romanian and Slovenian, but also Finnish, French, German and Irish Gaelic (new orthography). The focus lies more on letters than symbols. The currency sign is replaced with the Euro symbol.

[1]—only the IJ/ij (letter IJ) is missing, which is usually represented as IJ.
[2]—missing characters are in ISO 8859-15.
[3]—missing Ґ/ґ characters were reintroduced into Ukrainian in 1991.

Each part of ISO 8859 is designed to support languages that often borrow from each other, so the characters needed by each language are usually accommodated by a single part. However, there are some characters and language combinations that are not accommodated without transcriptions. Efforts were made to make conversions as smooth as possible. For example, German has all its seven special chars at the same positions in all Latin variants (1-4, 9-10, 13-16), and in many positions the characters only differ in the diacritics between the sets. In particular, variants 1-4 were designed jointly, and have the property that every encoded character appears either at a given position or not at all.

Table

Comparison of the various parts of ISO 8859
BinaryOctDecHex 123456789101113141516
10100000240160A0 Non-breaking space (NBSP)
10100001241161A1 ¡ĄĦĄЁ  ¡Ą¡Ą
10100010242162A2 ¢˘˘ĸЂ ¢¢Ē¢¢ą
10100011243163A3 £Ł£ŖЃ £££Ģ£££Ł
10100100244164A4 ¤¤¤¤Є¤¤¤Ī¤Ċ
10100101245165A5 ¥Ľ ĨЅ ¥¥Ĩċ¥
10100110246166A6 ¦ŚĤĻІ ¦¦¦Ķ¦ŠŠ
10100111247167A7 §§§§Ї §§§§§§§§
10101000250168A8 ¨¨¨¨Ј ¨¨¨ĻØšš
10101001251169A9 ©ŠİŠЉ ©©©Đ©©©©
10101010252170AA ªŞŞĒЊ ͺתŠŖªȘ
10101011253171AB «ŤĞĢЋ «««Ŧ«««
10101100254172AC ¬ŹĴŦЌ،¬¬¬Ž¬¬Ź
10101101255173AD ­­­­­­­­­­­­­­
10101110256174AE ®Ž ŽЎ  ®®Ū®®®ź
10101111257175AF ¯ŻŻ¯Џ ¯¯ŊÆŸ¯Ż
10110000260176B0 °°°°А °°°°°°°
10110001261177B1 ±ąħąБ ±±±ą±±±
10110010262178B2 ²˛²˛В ²²²ē²Ġ²Č
10110011263179B3 ³ł³ŗГ ³³³ģ³ġ³ł
10110100264180B4 ´´´´Д ΄´´īŽŽ
10110101265181B5 µľµĩЕ ΅µµĩµµ
10110110266182B6 śĥļЖ Άķ
10110111267183B7 ·ˇ·ˇЗ ·······
10111000270184B8 ¸¸¸¸И Έ¸¸ļøžž
10111001271185B9 ¹šıšЙ Ή¹¹đ¹¹č
10111010272186BA ºşşēК Ί÷ºšŗºș
10111011273187BB »ťğģЛ؛»»»ŧ»»»
10111100274188BC ¼źĵŧМ Ό¼¼ž¼ŒŒ
10111101275189BD ½˝½ŊН ½½½½œœ
10111110276190BE ¾ž žО Ύ¾¾ū¾ŸŸ
10111111277191BF ¿żżŋП؟Ώ ¿ŋæ¿ż
11000000300192C0 ÀŔÀĀР ΐ ÀĀĄÀÀÀ
11000001301193C1 ÁÁÁÁСءΑ ÁÁĮÁÁÁ
11000010302194C2 ÂÂÂÂТآΒ ÂÂĀÂÂÂ
11000011303195C3 ÃĂ ÃУأΓ ÃÃĆÃÃĂ
11000100304196C4 ÄÄÄÄФؤΔ ÄÄÄÄÄÄ
11000101305197C5 ÅĹĊÅХإΕ ÅÅÅÅÅĆ
11000110306198C6 ÆĆĈÆЦئΖ ÆÆĘÆÆÆ
11000111307199C7 ÇÇÇĮЧاΗ ÇĮĒÇÇÇ
11001000310200C8 ÈČÈČШبΘ ÈČČÈÈÈ
11001001311201C9 ÉÉÉÉЩةΙ ÉÉÉÉÉÉ
11001010312202CA ÊĘÊĘЪتΚ ÊĘŹÊÊÊ
11001011313203CB ËËËËЫثΛ ËËĖËËË
11001100314204CC ÌĚÌĖЬجΜ ÌĖĢÌÌÌ
11001101315205CD ÍÍÍÍЭحΝ ÍÍĶÍÍÍ
11001110316206CE ÎÎÎÎЮخΞ ÎÎĪÎÎÎ
11001111317207CF ÏĎÏĪЯدΟ ÏÏĻÏÏÏ
11010000320208D0 ÐĐ ĐаذΠ ĞЊŴÐĐ
11010001321209D1 ÑŃÑŅбرΡ ÑŅŃÑÑŃ
11010010322210D2 ÒŇÒŌвز  ÒŌŅÒÒÒ
11010011323211D3 ÓÓÓĶгسΣ ÓÓÓÓÓÓ
11010100324212D4 ÔÔÔÔдشΤ ÔÔŌÔÔÔ
11010101325213D5 ÕŐĠÕеصΥ ÕÕÕÕÕŐ
11010110326214D6 ÖÖÖÖжضΦ ÖÖÖÖÖÖ
11010111327215D7 ××××зطΧ ×Ũ×׌
11011000330216D8 ØŘĜØиظΨ ØØŲØØŰ
11011001331217D9 ÙŮÙŲйعΩ ÙŲŁÙÙÙ
11011010332218DA ÚÚÚÚкغΪ ÚÚŚÚÚÚ
11011011333219DB ÛŰÛÛл Ϋ ÛÛ ŪÛÛÛ
11011100334220DC ÜÜÜÜм ά ÜÜ ÜÜÜÜ
11011101335221DD ÝÝŬŨн έ İÝ ŻÝÝĘ
11011110336222DE ÞŢŜŪо ή ŞÞ ŽŶÞȚ
11011111337223DF ßßßßп ίßß฿ßßßß
11100000340224E0 àŕàāрـΰאàāąààà
11100001341225E1 ááááсفαבááįááá
11100010342226E2 ââââтقβגââāâââ
11100011343227E3 ãă ãуكγדããćããă
11100100344228E4 ääääфلδהääääää
11100101345229E5 åĺċåхمεוåååååć
11100110346230E6 æćĉæцنζזææęæææ
11100111347231E7 çççįчهηחçįēççç
11101000350232E8 èčèčшوθטèččèèè
11101001351233E9 ééééщىιיéééééé
11101010352234EA êęêęъيκךêęźêêê
11101011353235EB ëëëëыًλכëëėëëë
11101100354236EC ìěìėьٌμלìėģììì
11101101355237ED ííííэٍνםííķííí
11101110356238EE îîîîюَξמîîīîîî
11101111357239EF ïďïīяُοןïïļïïï
11110000360240F0 ðđ đȑِπנğðšŵðđ
11110001361241F1 ñńñņёّρסñņńññń
11110010362242F2 òňòōђْςעòōņòòò
11110011363243F3 óóóķѓ σףóóóóóó
11110100364244F4 ôôôôє τפôôōôôô
11110101365245F5 õőġõѕ υץõõõõõő
11110110366246F6 ööööі φצöööööö
11110111367247F7 ÷÷÷÷ї χק÷ũ÷÷ś
11111000370248F8 øřĝøј ψרøøųøøű
11111001371249F9 ùůùųљ ωשùųłùùù
11111010372250FA úúúúњ ϊתúúśúúú
11111011373251FB ûűûûћ ϋ ûûūûûû
11111100374252FC üüüüќ ό üü üüüü
11111101375253FD ýýŭũ§ ύLRMıý żýýę
11111110376254FE þţŝūў ώRLMşþ žŷþț
11111111377255FF ÿ˙˙˙џ   ÿĸ ÿÿÿ

At position 0xA0 there's always the non breaking space and 0xAD is mostly the soft hyphen, which only shows at line breaks. Other empty fields are either unassigned or the system used isn't able to display them.

There are new additions as ISO/IEC 8859-7:2003 and ISO/IEC 8859-8:1999 versions. LRM stands for left-to-right mark (U+200E) and RLM stands for right-to-left mark (U+200F).

Relationship to Unicode and the UCS

Since 1991, the Unicode Consortium has been working with ISO to develop the Unicode Standard and ISO/IEC 10646: the Universal Character Set (UCS) in tandem. This pair of standards was created to unify the ISO 8859 character repertoire, among others, by assigning each character, initially, to a 16-bit code value, with some code values left unassigned. Over time, their models adapted to map characters to abstract numeric code points rather than fixed bit-width values, so that more code points and encoding methods could be supported.

Unicode and ISO/IEC 10646 currently assign about 100,000 characters to a code space consisting of over a million code points, and they define several standard encodings that are capable of representing every available code point. The standard encodings of Unicode and the UCS use sequences of one to four 8-bit code values (UTF-8), sequences of one or two 16-bit code values (UTF-16), or one 32-bit code value (UTF-32 or UCS-4). There is also an older encoding that uses one 16-bit code value (UCS-2), capable of representing one-seventeenth of the available code points. Of these encoding forms, only UTF-8's byte sequences are in a fixed order; the others are subject to platform-dependent byte ordering issues that may be addressed via special codes or indicated via out-of-band means.

Newer editions of ISO 8859 express characters in terms of their Unicode/UCS names and the U+nnnn notation, effectively causing each part of ISO 8859 to be a Unicode/UCS character encoding scheme that maps a very small subset of the UCS to single 8-bit bytes. The first 256 characters in Unicode and the UCS are identical to those in ISO-8859-1.

ISO 8859 was favored throughout the 1990s, having the advantages of being well-established and more easily implemented in software: the equation of one byte to one character is simple and adequate for most single-language applications, and there are no combining characters or variant forms.

As the relative cost, in computing resources, of using more than one byte per character began to diminish, programming languages and operating systems added native support for Unicode alongside their system of code pages. As Unicode-enabled operating systems became more widespread, ISO 8859 and other legacy encodings became less popular. While remnants of ISO 8859 and single-byte character models remain entrenched in many operating systems, programming languages, data storage systems, networking applications, display hardware, and end-user application software, most modern computing applications use Unicode internally, and rely on conversion tables to map to and from the simpler encodings, when necessary.

Development status

The ISO/IEC 8859 standard was maintained by ISO/IEC Joint Technical Committee 1, Subcommittee 2, Working Group 3 (ISO/IEC JTC 1/SC 2/WG 3). In June 2004, WG 3 disbanded, and maintenance duties were transferred to SC 2. The standard is not currently being updated, as the Subcommittee's only remaining Working Group, WG 2, is concentrating on development of ISO/IEC 10646.

References

  • Published versions of each part of ISO/IEC 8859 are available, for a fee, from the ISO catalogue site (http://www.iso.ch/iso/en/stdsdevelopment/tc/tclist/TechnicalCommitteeStandardsListPage.TechnicalCommitteeStandardsList?COMMID=23) and from the ANSI eStandards Store (http://webstore.ansi.org/ansidocstore/find.asp?find_spec=8859).
  • PDF versions of the final drafts of some parts of ISO/IEC 8859 as submitted for review & publication by ISO/IEC JTC 1/SC 2/WG 3 are available at the WG 3 web site (http://anubis.dkuug.dk/JTC1/SC2/WG3/):
    • ISO/IEC 8859-1:1998 (http://anubis.dkuug.dk/JTC1/SC2/WG3/docs/n411.pdf) - 8-bit single-byte coded graphic character sets, Part 1: Latin alphabet No. 1 (draft dated February 12, 1998, published April 15, 1998)
    • ISO/IEC 8859-4:1998 (http://anubis.dkuug.dk/JTC1/SC2/WG3/docs/n413.pdf) - 8-bit single-byte coded graphic character sets, Part 4: Latin alphabet No. 4 (draft dated February 12, 1998, published July 1, 1998)
    • ISO/IEC 8859-7:1999 (http://anubis.dkuug.dk/jtc1/sc2/open/02n3329.pdf) - 8-bit single-byte coded graphic character sets, Part 7: Latin/Greek alphabet (draft dated June 10, 1999; superseded by ISO/IEC 8859-7:2003, published October 10, 2003)
    • ISO/IEC 8859-10:1998 (http://anubis.dkuug.dk/JTC1/SC2/WG3/docs/n415.pdf) - 8-bit single-byte coded graphic character sets, Part 10: Latin alphabet No. 6 (draft dated February 12, 1998, published July 15, 1998)
    • ISO/IEC 8859-11:1999 (http://anubis.dkuug.dk/jtc1/sc2/open/02n3333.pdf) - 8-bit single-byte coded graphic character sets, Part 11: Latin/Thai character set (draft dated June 22, 1999; superseded by ISO/IEC 8859-11:2001, published Dec 15, 2001)
    • ISO/IEC 8859-13:1998 (http://anubis.dkuug.dk/JTC1/SC2/WG3/docs/n451.pdf) - 8-bit single-byte coded graphic character sets, Part 13: Latin alphabet No. 7 (draft dated April 15, 1998, published October 15, 1998)
    • ISO/IEC 8859-15:1998 (http://anubis.dkuug.dk/JTC1/SC2/WG3/docs/n404.pdf) - 8-bit single-byte coded graphic character sets, Part 15: Latin alphabet No. 9 (draft dated August 1, 1997; superseded by ISO/IEC 8859-15:1999, published March 15, 1999)
    • ISO/IEC 8859-16:2000 (http://anubis.dkuug.dk/jtc1/sc2/open/02n3389.pdf) - 8-bit single-byte coded graphic character sets, Part 16: Latin alphabet No. 10 (draft dated November 15, 1999; superseded by ISO/IEC 8859-16:2001, published July 15, 2001)
  • ECMA standards, which in intent correspond exactly to the ISO/IEC 8859 character set standards, can be found at:
    • Standard ECMA-94 (http://www.ecma-international.org/publications/standards/Ecma-094.htm): 8-Bit Single Byte Coded Graphic Character Sets - Latin Alphabets No. 1 to No. 4 2nd edition (June 1986)
    • Standard ECMA-113 (http://www.ecma-international.org/publications/standards/Ecma-113.htm): 8-Bit Single-Byte Coded Graphic Character Sets - Latin/Cyrillic Alphabet 3rd edition (December 1999)
    • Standard ECMA-114 (http://www.ecma-international.org/publications/standards/Ecma-114.htm): 8-Bit Single-Byte Coded Graphic Character Sets - Latin/Arabic Alphabet 2nd edition (December 2000)
    • Standard ECMA-118 (http://www.ecma-international.org/publications/standards/Ecma-118.htm): 8-Bit Single-Byte Coded Graphic Character Sets - Latin/Greek Alphabet (December 1986)
    • Standard ECMA-121 (http://www.ecma-international.org/publications/standards/Ecma-121.htm): 8-Bit Single-Byte Coded Graphic Character Sets - Latin/Hebrew Alphabet 2nd edition (December 2000)
    • Standard ECMA-128 (http://www.ecma-international.org/publications/standards/Ecma-128.htm): 8-Bit Single-Byte Coded Graphic Character Sets - Latin Alphabet No. 5 2nd edition (December 1999)
    • Standard ECMA-144 (http://www.ecma-international.org/publications/standards/Ecma-144.htm): 8-Bit Single-Byte Coded Character Sets - Latin Alphabet No. 6 3rd edition (December 2000)
  • ISO/IEC 8859-1 to Unicode mapping tables (ftp://ftp.unicode.org/Public/MAPPINGS/ISO8859) as plain text files are at the Unicode FTP site.
  • Informal descriptions and code charts for most ISO 8859 standards are available in ISO 8859 Alphabet Soup (http://czyborra.com/charsets/iso8859.html) (Mirror) (http://www.lysator.liu.se/~jmo/czyborra_index.html)de:ISO 8859

he:ISO 8859 pl:ISO 8859 tt:ISO 8859 zh:ISO 8859

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