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Unicode is preferred to ASCII because it permits the inclusion of accents, scientific symbols and characters used in
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ASCII characters are encoded as a single byte.
- Greek, Hebrew, Arabic and most accented European characters are encoded as two bytes;
- All other characters are encoded as three bytes;
- The individual characters are encoded according to the following rules.
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Characters in the 'u+0000' to 'u+007f' are encoded as a single byte.
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byte 0
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0
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bits 0-6
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Characters in the 'u+0080' to 'u+07ff' are encoded as two bytes.
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byte 0
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byte 1
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1
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1
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0
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bits 6-10
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1
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0
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bits 0-5
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Characters in the 'u+0800' to 'u+ffff' are encoded as three bytes:
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byte 0
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byte 1
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byte 2
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1
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1
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1
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0
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bits 12-15
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1
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0
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bits 6-11
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1
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0
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bits 0-5
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The first bits of each byte indicate the role of the byte. A zero bit terminates this role information. Thus possible byte values are:
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Bits
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Byte value
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0???? ?? ?
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000-127
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Single byte encoding of a character
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10??? ?? ?
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128-191
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Continuation of a multi-byte encoding
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110?? ?? ?
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192-223
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First byte of a two byte character encoding
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1110? ?? ?
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224-239
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First byte of a three byte character encoding
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1111? ?? ?
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240-255
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Invalid in UTF-8
was adopted is an IETF Internet Standard (it was initially adopted by IETF in 1996 to restrict some code values in 1998 and 2003). In 2008 UTF-8 became the most widely used for of encoding in web pages.
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Note that SNOMED CT does not use, or require use of, the Byte Order Mark (BOM) specified by the Unicode standard because all SNOMED CT release files use UTF-8. |
of characters in
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| Display Footnotes Macro |
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Character
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S
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C
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T
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0053
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0043
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0054
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00AE
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2462
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Bytes
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01010011
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01000011
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01010100
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11000010
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10101110
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11101111
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10111111
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