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Gloss
t
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_GoBack _GoBack UTF-8

is  is an efficient encoding of Unicode character -

Specref
RefType (data type) t String

that recognizes the fact that the majority of text-based communications are in ASCII. It therefore optimizes the encoding of these characters.

Unicode is preferred to ASCII because it permits the inclusion of accents, scientific symbols and characters used in

Gloss
t languages

other than English. The

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t UTF-8

format  format is a standard encoding that provides the most efficient means of encoding 16-bit Unicode characters in cases where the majority of characters are in the ASCII range. Both Both 

Gloss
t UTF-8

and the alternative

Gloss
t UTF

16

-16

 encoding are supported encoding issupported by all widely used operating systems and major applications (and has been for more than 15 years).

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t SNOMED CT

uses the UTF-8 representation of characters in

Gloss
t terms

and other text fields.

...

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

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t range

'u+0000' to 'u+007f' are encoded as a single byte.

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Characters in the

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t range

'u+0080' to 'u+07ff' are encoded as two bytes.

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Characters in the

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t range

'u+0800' to 'u+ffff' are encoded as three bytes:

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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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Character

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S

...

C

...

T

...

 

...

 

...

 

...

 

...

 

...

 

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Unicode

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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

...

 

...

 

...

 

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.

Gloss
t SNOMED CT

uses the

Gloss
t UTF-8

 representation

Footnote Macro
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

Gloss
t terms

and other text fields.

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Display Footnotes Macro

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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

...