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Although a BOM could be used with UTF-32, this encoding is rarely used for transmission. Otherwise the same rules as for UTF-16 are applicable. The BOM for little-endian UTF-32 is the same pattern as a little-endian UTF-16 BOM followed by a UTF-16 NUL character, an unusual example of the BOM being the same pattern in two different encodings.
The nonet encodings UTF-9 and UTF-18 are April Fools' Day RFC joke specifications, although UTF-9 is a functioning nonet Unicode transformation format, and UTF-18 is a functioning nonet encoding for all non-Private-Use code points in Unicode 12 and below, although not for Supplementary Private Use Areas or portions of Unicode 13 and later.
UTF-8 is a character encoding standard used for electronic communication. Defined by the Unicode Standard, the name is derived from Unicode Transformation Format – 8-bit. [1] Almost every webpage is stored in UTF-8. UTF-8 supports all 1,112,064 [2] valid code points using a variable-width encoding of one to four one-byte (8-bit) code units.
The Universal Coded Character Set (UCS, Unicode) is a standard set of characters defined by the international standard ISO/IEC 10646, Information technology — Universal Coded Character Set (UCS) (plus amendments to that standard), which is the basis of many character encodings, improving as characters from previously unrepresented writing systems are added.
For UTF-8, the BOM is optional, while it is a must for the UTF-16 and the UTF-32 encodings. (Note: UTF-16 and UTF-32 without the BOM are formally known under different names, they are different encodings, and thus needs some form of encoding declaration – see UTF-16BE, UTF-16LE, UTF-32LE and UTF-32BE.) The use of the BOM character (U+FEFF ...
The Unicode Consortium and the ISO/IEC JTC 1/SC 2/WG 2 jointly collaborate on the list of the characters in the Universal Coded Character Set.The Universal Coded Character Set, most commonly called the Universal Character Set (abbr. UCS, official designation: ISO/IEC 10646), is an international standard to map characters, discrete symbols used in natural language, mathematics, music, and other ...
A byte order mark (BOM) within the first three bytes of the document; The HTTP Content-Type or other transport layer information; Analysis of the document bytes looking for specific sequences or ranges of byte values, [5] and other tentative detection mechanisms. Characters outside of the printable ASCII range (32 to 126) usually appear ...
The sentence that starts, “One reason the UTF-8 BOM is not recommended” does not imply that the Unicode standard recommends against using a BOM. It merely means that the Unicode standard does not recommend for using a BOM for UTF-8 and gives an example of why Unicode’s recommendation was formulated the way it is. The Unicode caution may ...