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ISO/IEC 8859-4:1997 (E)

ISO/IEC 2022:1994,

Information technology –

Character code structure and extension techniques.

ISO/IEC 4873:1991,

Information technology –

ISO 8-bit

code

for

information

interchange

–

Structure and rules for implementation.

ISO/IEC 8824-1:1995,

Information technology –

Abstract Syntax Notation One (ASN.1): Specifica-

tion of basic notation.

4 Definitions

For the purposes of this part of ISO/IEC 8859 the

following definitions apply:

4.1 bit combination: An ordered set of bits used

for the representation of characters.

4.2 byte: A bit string that is operated upon as a unit.

4.3 character:

A member of a set of elements

used for the organization, control, or representation

of data.

4.4 code table:

A table showing the characters

allocated to each bit combination in a code.

4.5 coded character set; code:

A set of

unambiguous rules that establishes a character set

and

the

one-to-one

relationship

between

the

characters of the set and their bit combinations.

4.6 coded-character-data-element

(CC-data-

element): An element of interchanged information

that is specified to consist of a sequence of coded

representations of characters, in accordance with

one

identified

standards

for

coded

character sets.

4.7 graphic character: A character, other than a

control function, that has a visual representation

normally handwritten, printed or displayed, and that

has a coded representation consisting of one or

more bit combinations.

NOTE – In ISO/IEC 8859 a single bit combination is used

to represent each character.

4.8 graphic symbol: A visual representation of a

graphic character or of a control function.

4.9 position: That part of a code table identified

by its column and row coordinates.

5 Notation, code table, and names

5.1 Notation

The bits of the bit combinations of the 8-bit code are

identified by b

8,b7,b6,b5,b4,b3,b2, and b1, where

8 is the highest-order, or most-significant bit and b1

is the lowest-order, or least-significant bit.

The bit combinations may be interpreted to represent

numbers

in binary

notation by

attributing the

following weights to the individual bits:

Using these weights, the bit combinations are

Bit

Weight

128

identified by notations of the form xx/yy, where xx

and yy are numbers in the range 00 to 15.

The

correspondence between the notations of the form

xx/yy and the bit combinations consisting of the bits

8 to b1 is as follows:

– xx is the number represented by b

8,b7,b6 and b5

where these bits are given the weights 8, 4, 2, and

1 respectively.

– yy is the number represented by b

4,b3,b2 and b1

where these bits are given the weights 8, 4, 2, and

1 respectively.

The bit combinations are also identified by notations

of the form hk, where h and k are numbers in the

range 0 to F in hexadecimal notation. The number

h is the same as the number xx described above,

and the number k the same as the number yy

described above.

5.2 Layout of the code table

An 8-bit code table consists of 256 positions

arranged in 16 columns and 16 rows. The columns

and the rows are numbered 00 to 15.

In hexa-

decimal notation the columns and the rows are

numbered 0 to F.

The code table positions are identified by notations

of the form xx/yy, where xx is the column number

and yy is the row number.

The column and row

numbers are shown at the top and left edges of the

table respectively.

The code table positions are

also identified by notations of the form hk, where h

is the column number and k is the row number in

hexadecimal notation.

The column and row

numbers are shown at the bottom and right edges of

the table respectively.

The positions of the code table are in one-to-one

correspondence with the bit combinations of the

code. The notation of a code table position, of the

form xx/yy, or of the form hk, is the same as that of

the corresponding bit combination.

5.3 Names and meanings

This part of ISO/IEC 8859 assigns a unique name

and a unique identifier to each graphic character.

These names and identifiers have been taken from

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