Arabic Presentation Forms-B

From HandWiki
See also: Arabic Presentation Forms-A (Unicode block), Alphabetic Presentation Forms (Unicode block), and Specials (Unicode block)
Short description: Unicode character block
Arabic Presentation Forms-B
RangeU+FE70..U+FEFF
(144 code points)
PlaneBMP
ScriptsArabic (140 char.)
Common (1 char.)
Symbol setscontextual and isolate forms of Arabic letters and points
Assigned141 code points
Unused3 reserved code points
Unicode version history
1.0.0140 (+140)
3.2141 (+1)
Note: [1][2]
The characters in this block were re-ordered in Unicode 1.0.1, in the process of merging with ISO/IEC 10646.[3]

Arabic Presentation Forms-B is a Unicode block encoding spacing forms of Arabic diacritics, and contextual letter forms. The special codepoint ZWNBSP (zero width no-break space) is also here, which is only meant for a byte order mark (that may precede text, Arabic or not, or be absent).[note 1] The block name in Unicode 1.0 was Basic Glyphs for Arabic Language;[4] its characters were re-ordered in the process of merging with ISO 10646 in Unicode 1.0.1 and 1.1.[3]

The presentation forms are present only for compatibility with older standards, and are not currently needed for coding text.[5]

Block

History

The following Unicode-related documents record the purpose and process of defining specific characters in the Arabic Presentation Forms-B block:

Version Final code points[lower-alpha 1] Count UTC ID L2 ID WG2 ID Document
1.0.0 U+FE70..FE72, FE74, FE76..FE7F 14 UTC/1991-048B Whistler, Ken (1991-03-27), Draft Minutes from the UTC meeting #46 day 2, 3/27 at Apple 
U+FE80..FEFC 125 (to be determined)
U+FEFF 1 UTC/1991-054 Whistler, Ken, FF Proposal 
UTC/1991-048B Whistler, Ken (1991-03-27), Draft Minutes from the UTC meeting #46 day 2, 3/27 at Apple 
L2/05-137 Freytag, Asmus (2005-05-10), Handling "defective" names 
L2/05-108R Moore, Lisa (2005-08-26), UTC #103 Minutes, "Create a "Normative Name Alias" property and file in the UCD. Populate the property with names from the sections "Typos" and "Bad or misleading names" from document L2/05-137." 
L2/01-095 N2322 Umamaheswaran, V. S. (2001-02-05), Proposal to add "Arabic Tail Fragment" character 
L2/01-012R Moore, Lisa (2001-05-21), Minutes UTC #86 in Mountain View, Jan 2001, "Accept the addition of the character ARABIC TAIL FRAGMENT at U+FE73, with the properties of an extender." 
L2/01-344 N2353 (pdf, doc) Umamaheswaran, V. S. (2001-09-09), Minutes from SC2/WG2 meeting #40 -- Mountain View, April 2001 
  1. ↑ Proposed code points and characters names may differ from final code points and names.

References

  1. ↑ "Unicode character database". The Unicode Standard. https://www.unicode.org/ucd/. 
  2. ↑ "Enumerated Versions of The Unicode Standard". The Unicode Standard. https://www.unicode.org/versions/enumeratedversions.html. 
  3. ↑ 3.0 3.1 "Unicode 1.0.1 Addendum". The Unicode Standard. 1992-11-03. https://www.unicode.org/versions/Unicode1.0.0/Notice.pdf. 
  4. ↑ "3.8: Block-by-Block Charts". The Unicode Standard. Unicode Consortium. https://www.unicode.org/versions/Unicode1.0.0/CodeCharts2.pdf. 
  5. ↑ The Unicode Consortium. The Unicode Standard, Version 6.0.0, (Mountain View, CA: The Unicode Consortium, 2011. ISBN:978-1-936213-01-6), Chapter 8

Notes

  1. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named {{{1}}}



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