SIMSCRIPT II.5 Programming Language

SIMSCRIPT II.5 Programming Language
are unchanged except for M.KENNEL which is now 0. Although MYDOG is no longer in
KENNEL(FARM), its attribute S.KENNEL still points to DOG. In set membership, pointer values are
meaningless once an entity is removed from a set. If the variable name MYDOG were replaced by
DOG in figure 4-18, this figure would show the organization of KENNEL(FARM) after MYDOG had
been removed from figure 4-19.
F.KENNEL
L.KENNEL
N.KENNEL
FARM
3
LICENSE
P.KENNEL
S.KENNEL
M.KENNEL
1 2 3
0
0
LICENSE
248
P.KENNEL
S.KENNEL
M.KENNEL 0
DOG
LICENSE
567
P.KENNEL
0
S.KENNEL
M.KENNEL 0
Figure 4-17. Entity Records
158