bracketed DBCS. A character string in which each
character is represented by 2 bytes. The character string
starts with a shift-out (SO) character and ends with a
shift-in (SI) character. Contrast with DBCS-graphic.
byte. A group of 8 adjacent bits. In the EBCDIC
coding system, 1 byte can represent a character. In the
double-byte coding system, 2 bytes represent a
changed subfile record. A subfile record into which
the work station user has entered data, or a subfile
record for which a write or change operation was
issued with the DDS keyword SFLNXTCHG or
DSPATR(MDT) in effect.
character. Any letter, number, or other symbol in the
data character set that is part of the organization,
control, or representation of data.
character constant. The actual character value (a
symbol, quantity, or constant) in a source program that
is itself data, instead of reference to a field that contains
the data. Contrast with numeric constant.
character field. An area that is reserved for
information that can contain any of the characters in
the character set. Contrast with numeric field.
character set. A group of characters used for a specific
reason; for example, the set of characters the display
station can display, the set of characters a printer can
print, or a particular set of graphic characters in a code
page; for example, the 256 EBCDIC characters.
character string. A sequence of consecutive characters
that are used as a value.
characters per inch (cpi). The number of characters
printed horizontally within an inch across a page.
check digit. The far right number of a self-check field
used to verify the accuracy of the field.
close. The function that ends the connection between a
file and a program, and ends the processing. Contrast
code page. (1) A particular assignment of hexadecimal
identifiers to graphic characters. (2) In AFP support, a
font file that associates code points and graphic
code point. (1) One of the bit patterns assigned to a
character in a character set. On the AS/400 system, a
code point is represented by a hexadecimal number.
For example, in code page 256 (EBCDIC), the letter “e”
is assigned a code point of hex 85. (2) In AFP support,
an 8-bit binary number representing one of 256
code-page ID. A 5-digit registered identifier used to
specify a particular assignment of code points to
graphic characters. The code-page ID is the second part
of the QCHRID system value or the CHRID parameter
value. See also graphic character-set ID.
coded character set identifier (CCSID). A 16-bit
number identifying a specific set of encoding scheme
identifiers, character set identifiers, code page
identifiers, and other relevant information that uniquely
identifies the coded graphic character representation
coded font. In AFP support, a font file that associates
acode page and a font character set. For double-byte
fonts, a coded font associates multiple pairs of code
pages and font character sets.
coded graphic character-set ID. A 10-digit identifier
(two 5-digit identifiers separated by a space) that is the
combination of a graphic character-set ID and a
code-page ID. See also graphic character-set ID and
collating sequence. The order in which characters are
arranged within the computer for sorting, combining,
column separator. A symbol on each side of a position
of a field on a display. This symbol does not occupy a
position on the display.
command. A statement used to request a function of
the system. A command consists of the command name
abbreviation, which identifies the requested function,
and its parameters.
command attention (CA) key. In DDS, a keyboard key
that can be specified with the CA keyword to request
the function specified by the keyword. Data is not
returned to the system. Contrast with command function
command function (CF) key. In DDS, a keyboard key
that can be specified with the CF keyword to request
the function specified by the keyword. Data is returned
to the system. Contrast with command attention (CA) key.
compile. To translate a program written in a
high-level programming language into a
compile time. The time during which a source
program is translated by a compiler into a
compiler listing. A printout that is produced by
compiling a program or creating a file and that
optionally includes, for example, a line-by-line list of
the high-level language source, a cross-reference list,
diagnostic information; and for programs, the
description of the externally described files. See also
OS/400 DDS Reference V4R5
composite key. A key for a file or record format that is
composed of more than one key field.
concatenated field. Two or more fields that are
combined to make one field in a logical file.
condition name. For display files, a name used to
control the selection of DDS keywords and display
locations based on the model of the display station.
conditioning. A feature that helps users to develop
and create display files, printer files, and database files.
constant field. In an externally described display or
printer file, an unnamed field that contains actual data
that is passed to the display or printer but is unknown
to the program passing it.
continuation line. An additional line (or lines)
required to continue the coding of a CL command or a
DDS keyword and its value.
country ID. See country identifier (country ID).
country identifier (country ID). The 2-character
representation for the country associated with an object.
For example, documents and user profiles can have a
country associated with them.
creation date. The system date when an object is
created. See also job date, and system date.
currency symbol. A character such as the dollar sign
($) used to identify monetary values.
cursor. A movable symbol, often a blinking or solid
block of light, that tells the display station user where
to type, or identifies a choice to select.
data description specifications (DDS). A description
of the user’s database or device files that is entered into
the system in a fixed form. The description is then used
to create files.
data file. A group of related data records organized in
aspecific order. A data file can be created by the
specification of FILETYPE(*DATA) on the create
commands. Contrast with source file.
data file utility (DFU). The part of the Application
Development ToolSet licensed program that is used to
enter, maintain, and display records in a database file.
data stream. All information (data and control
commands) sent over a data link usually in a single
read or write operation.
data type. A characteristic used for defining data as
numeric or character.
database. All the data files stored in the system.
database file. One of several types of the system
object type *FILE kept in the system that contains
descriptions of how input data is to be presented to a
program from internal storage and how output data is
to be presented to internal storage from a program. See
also physical file and logical file.
DBCS. See double-byte character set (DBCS).
DBCS conversion. A function of the operating system
that allows a display station user to enter alphanumeric
data and request that the alphanumeric data be
converted to double-byte data.
DBCS-either. Pertaining to a character string that is
either SBCS or bracketed DBCS, but not both. Contrast
with DBCS-graphic, DBCS-only, and DBCS-open.
DBCS-graphic. Pertaining to a character string in
which each character is represented by 2 bytes. The
character string does not contain shift-out (SO) and
shift-in (SI) characters. Contrast with DBCS-either,
DBCS-only, and DBCS-open.
DBCS-only. Pertaining to a character string that is
only bracketed DBCS. Contrast with DBCS-either,
DBCS-graphic, and DBCS-open.
DBCS-open. Pertaining to a character string that can
be a mixture of SBCS and bracketed DBCS. Contrast
with DBCS-either, DBCS-graphic, and DBCS-only.
DDS. See data description specifications (DDS).
decimal position. (1) The location of the decimal point
in a series of numbers. (2) Numbers to the right of the
decimal point. For example, 4.009 has three decimal
default. (1) A value that is automatically supplied or
assumed by the system or program when no value is
specified by the user. (2) In DDS, the value specified by
the user with the DFT or DFTVAL keyword in DDS.
descending sequence. The arrangement of data in
order from the highest value to the lowest value,
according to the rules for comparing data. Contrast
with ascending sequence.
DEVD. See device description.
device description. An object that contains
information describing a particular device or logical
unit (LU) that is attached to the system. A device
description is a description of the logical connection
between two LUs (local and remote locations). The
system-recognized identifier for the object type is
device file. One of several types of the system object
type *FILE. A device file contains a description of how
data is to be presented to a program from a device or
how data is to be presented to the device from the
program. Devices can be display stations, printers,
diskette units, tape units, or remote systems.
DFU. See data file utility (DFU).
digit. Any of the numerals from 0 through 9.
display file. A device file to support a display station.
display screen. The part of the display device, which
is similar to a television (TV) picture tube, used to
display information entered or received at a display
display station. A device that includes a keyboard
from which an operator can send information to the
system and a display screen on which an operator can
see the information sent to or the information received
from the system.
double precision. The specification that causes a
floating-point value to be stored (internally) in the long
format (two computer words). Double precision is
known as long precision in BASIC. Contrast with single
double-byte character. An entity that requires two
double-byte character set (DBCS). A set of characters
in which each character is represented by 2 bytes.
Languages such as Japanese, Chinese, and Korean,
which contain more symbols than can be represented
by 256 code points, require double-byte character sets.
Because each character requires 2 bytes, the typing,
displaying, and printing of DBCS characters requires
hardware and programs that support DBCS. Four
double-byte character sets are supported by the system:
Japanese, Korean, Simplified Chinese, and Traditional
Chinese. Contrast with single-byte character set (SBCS).
double-byte coded font. In AFP support, a font in
which the characters are defined by 2 bytes: the first
defining a coded font section, the second defining a
code point. Synonymous with double-byte font.
Contrast with single-byte coded font.
draft. A printed copy of a document that is not yet
duplicate key value. The occurrence of the same value
in a key field or in a composite key in more than one
record in a file.
dynamic select/omit. Selection and omission of logical
file records performed during processing, instead of
when the access path (if any) is maintained. Dynamic
select/omit may also be used when no keyed access
edit. To change a numeric field for output by
suppressing zeros and inserting commas, periods,
currency symbols, the sign status, or other constant
edit code. A letter or number indicating that editing
should be done according to a defined pattern before a
field is displayed or printed. Contrast with edit word.
edit description. A description of a user-defined edit
code. The system-recognized identifier is *EDTD.
edit word. A user-defined word with a specific format
that indicates how editing should be done. Contrast
with edit code.
electronic overlay. An AFP resource object that is a
collection of predefined data, such as lines, shading,
text, boxes, or logos, that can be merged with variable
data on a page while printing. The system-recognized
identifier for the object type is *OVL.
embedded blank. A space between characters within
aunit of data.
ending attribute character. For a display file, the
character following the last position in a field.
exponent. (1) A number, indicating to which power
another number (the base) is to be raised. (2) In
floating-point format, an integer constant specifying the
power of ten by which the base of the decimal
floating-point number is to be multiplied.
expression. In DDS, a pair of values that represents a
single parameter value.
externally described data. Data contained in a file for
which the fields and the records are described outside
of the program (such as with files created by DDS,
IDDU, or the DB2 UDB for AS/400 licensed program)
that processes the file. Contrast with program-described
externally described file. A file in which the records
and fields are described to the system when the file is
created, and used by the program when the file is
processed. Contrast with program-described file.
field. A group of related bytes (such as name or
amount) that is treated as a unit in a record.
field level specifications. In DDS, specifications coded
on the same line as a field name or on lines
immediately following a field name. See also file level
specifications, record level specifications, help level
specifications, join level specifications, key field level
specifications, and select/omit level specification.
field reference file. A physical file that contains no
data, only descriptions of fields.
field selection. A function that uses the state of the
option indicators to display or print data when a record
format is written.
OS/400 DDS Reference V4R5
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