IBM 6400 Programmer's Reference Manual page 216

Glossary
reference point. The X axis coincides with the
character baseline.
character density. The number of characters per inch
(cpi) in a bar code symbology. In most cases, the
range is three to ten cpi. See also bar code density,
density, and information density.
character direction. In GOCA, an attribute controlling
the direction in which a character string grows
relative to the inline direction. Values are:
left-to-right, right-to-left, top-to-bottom, and
bottom-to-top. Synonymous with direction.
character increment. The distance from a character
reference point to a character escapement point. For
each character, the increment is the sum of a
character's A-space, B-space, and C-space. A
character's character increment is the distance the
inline coordinate is incremented when that character
is placed in a presentation space or on a physical
medium. Character increment is a property of each
graphic character in a font and of the font's character
rotation.
character metrics. Measurement information that
defines individual character values such as height,
width, and space. Character metrics can be
expressed in specific fixed units, such as pels, or in
relative units that are independent of both the
resolution and the size of the font. Often included as
part of the more general term "font metrics". See
also character set metrics and font metrics.
character precision. The acceptable amount of
variation in the appearance of a character on a
physical medium from a specified ideal appearance,
including no acceptable variation. Examples of
appearance characteristics that can vary for a
character are shape and position.
character reference point. The origin of a character
coordinate system. The X axis is the character
baseline.
character rotation. The alignment of a character with
respect to its character baseline, measured in
degrees in a clockwise direction. Examples are 0
90 , 180 , and 270 . Zero-degree character rotation
° ° °
exists when a character is in its customary alignment
with the baseline. Contrast with rotation.
character set. A finite set of different graphic or
control characters that is complete for a given
purpose. For example, the character set in ISO
Standard 646, 7-bit Coded Character Set for
Information Processing Interchange.
character set attribute. An attribute used to specify a
coded font.
character set metrics. The measurements used in a
font. Examples are height, width, and character
200
6400 IPDS
increment for each character of the font. See also
character metrics and font metrics.
character shear. The angle of slant of a character
cell that is not perpendicular to a baseline.
Synonymous with shear.
character string. A sequence of characters.
check character. In bar codes, a character included
within a bar code message whose value is used to
perform a mathematical check to ensure the accuracy
of that message. Synonymous with check digit.
check digit. In bar codes, a character included within
a bar code message whose value is used to perform a
mathematical check to ensure the accuracy of that
message. Synonymous with check character.
clear area. A clear space that contains no
machine-readable marks preceding the start
character of a bar code symbol or following the stop
character. Synonymous with quiet zone. Contrast
with intercharacter gap and space.
clipping. Eliminating those parts of a picture that are
outside of a clipping boundary such as a viewing
window or presentation space. See also viewing
window. Synonymous with trimming.
Codabar. A bar code symbology characterized by a
discrete, self-checking, numeric code with each
character represented by a stand-alone group of four
bars and the three spaces between them.
CODE. A data type for architecture syntax that
indicates an architected constant to be interpreted as
defined by the architecture.
Code 128. A bar code symbology characterized by a
variable-length, alphanumeric code with 128
characters.
coded font. (1) A resource containing elements of a
code page and a font character set, used for
presenting text, graphics character strings, and bar
code HRI. See also code page and font character set.
(2) In FOCA, a resource containing the resource
,
°
names of a valid pair of font character set and code
page resources. The graphic character set of the font
character set must match the graphic character set of
the code page for the coded font resource pair to be
valid. (3) In the IPDS architecture, a raster font
resource containing code points that are directly
paired to font metrics and the raster representation of
character shapes, for a specific graphic character set.
(4) In the IPDS architecture, a font resource
containing descriptive information, a code page, font
metrics, and a digital-technology representation of
character shapes for a specific graphic character set.
coded graphic character set. A set of graphic
characters with their assigned code points.