User interface Subschema DDL
U929-J-Z125-9-76 191
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Grouping record elements into a group item
level-number-1 group-item-name[ GROUP-USAGE IS NATIONAL]
[ OCCURS integer TIMES].
{level-number-2 record-element-name PICTURE.....
USAGE.....
OCCURS.....}....
A group item is a named group of record elements within a record ty pe. A record element
can be an item, a vector or even a group item.
group-item-name specifies the name of a group item.
record-element-name specifies the record element to be declared par t of the group item. This
can be:
– a record element to be copied from the schema into the subsc hema. It is copied as
described on pages 186 and 188 if it is an item, as desc ribed on page 189 if it is a vector
or as described on page 190 if it is a repeating group.
– a group item, which is defined as described in this sect ion.
level-number-2 must be greater than level-number-1.
The following applies for all record elements which are to be grouped into a group item:
Record elements must have the same level number if they have the next higher group item
in common.
You use the GROUP-USAGE clause to declare a national data group, i.e. a data group
which is treated in its entirety like a national data item. The GROUP-USAGE claus e may
only be specified if all lower-ranking record elements are of the type NATIONAL and level-
number-1 is not equal to 01.