Data Definition Language (DDL) Reference Manual

Definition Attributes
Data Definition Language (DDL) Reference Manual—529431-004
6-37
SPI-NULL
SPI-NULL
The SPI-NULL clause specifies an SPI null value for a field or group in an SPI-
extensible structured token or for a field or group within a group definition.
character
is any ASCII character.
number
is any number from 0 through 255.
constant-name
is the name of a constant in the open dictionary. The constant value must be a
valid character or number value.
DDL Output (TACL Code)
?Section A Struct
Begin
STRUCT B;
BEGIN CHAR BYTE(0:3); END;
STRUCT C REDEFINES B;
Begin
STRUCT C^1;
BEGIN CHAR BYTE(0:1); END;
STRUCT C^2;
BEGIN CHAR BYTE(0:1); END;
End;
STRUCT D;
Begin
CHAR D^1;
CHAR D^2 REDEFINES D^1;
End;
STRUCT E;
BEGIN CHAR BYTE(0:4); END;
STRUCT F REDEFINES E;
Begin
STRUCT F^1;
BEGIN CHAR BYTE(0:2); END;
STRUCT F^2;
BEGIN CHAR BYTE(0:1); END;
End;
End;
Note. Use the SPI-NULL clause only if you plan to use SPI messages to communicate among
processes in a Distributed Systems Management (DSM) environment.
SPI-NULL {"character " | number | constant-name }
Example 6-27. REDEFINES Clause With TACL Output (page2of2)