Data Definition Language (DDL) Reference Manual

Definitions and Records
Data Definition Language (DDL) Reference Manual—529431-004
5-24
Other Elements
def-name-1 TYPE def-name-2
defines a new data structure, def-name-1, by referring to a previously defined
data structure, def-name-2. Both def-name-1 and def-name-2 are DLL
names.
END [ . ]
ends either a group DEFINITION statement, a single-field DEFINITION statement
that includes BEGIN, or a RECORD statement.
level-number { field-name | group-name | FILLER }
specifies a field or group of fields within a group definition.
level-number
is a two-digit number from 02 through 49 that establishes the hierarchy of fields
or groups of fields within the definition or record.
Level number rules:
•
The DEFINITION or RECORD statement does not have a level number; it
is implicitly at level 01.
•
Each group and field within a group DEFINITION statement or a RECORD
statement has a level number to indicate its relationship to other groups
and fields within the group. A group of level nn includes all following
groups and fields with level numbers greater than nn up to the next group
or field of level nn or less.
•
Level numbers need not be assigned sequentially. For instance, an
level-02 group can contain two level-05 fields with no intervening level-03
or level-04 fields.
•
If a field is defined by a TYPE clause that refers to a group definition, the
field’s level number replaces the implicit level-01 number of the referenced
definition, and the level numbers of the definition’s member fields are
adjusted accordingly.
•
If a field is defined by a TYPE clause that refers to a previous definition,
the level number of any element following the field must be less than or
equal to the level number of the field.
field-name
is a name that uniquely identifies a field within the enclosing group description
or definition.
group-name
is a name that uniquely identifies a group within the enclosing group
description or definition.