
E
SELF-DESCRIBING
FILES
A
self-describing
le
is
created
when
the
SA
VE
command
is
executed.
A
le
is
considered
to
b e
self-describing
when
the
user
lab
els
con
tain
information
ab out
the
format
of
the
le.
A
self-describing
(SD)
le
is
comp osed
of
t
w
o
or
more
user
lab
els
and
data.
FILE
D
A
T
A
Eac
h
record
in
the
le
holds
an
IMA
GE
en
try
that
qualied
from
a
FIND
or
MUL
TIFIND
retriev
al.
The
n
um
b er
of
records
in
the
le
is
the
same
as
the
n
um
b er
of
en
tries
retrieved
and
the
size
of
eac
h
record
is
the
same
as
the
size
of
the
retrieved
en
try
.
In
a
FIND,
the
records
are
the
size
of
the
en
tries
in
a
single
data
set.
In
a
MUL
TIFIND,
the
records
are
the
size
of
the
en
tries
in
a
comp ound
data
set.
A
comp ound
data
set
en
try
is
the
com
bined
size
of
the
en
tries
in
the
single
data
sets
of
whic
h
it
is
comprised
(sp ecied
in
the
JOIN
command).
The
data
in
the
le
is
stored
in
the
same
form
as
the
data
in
the
IMA
GE
data
base.
Numeric
data
is
stored
in
binary
form
and
m
ust
b e
con
v
erted
to
ASCI I
b efore
it
can
b e
display
ed.
USER
LABELS
There
are
t
w
o
t
yp es
of
user
lab
els
whic
h
b oth
con
tain
descriptive
information.
One
t
yp e
con
tains
global
information
ab out
the
le
and
the
data
it
con
tains.
The
other
t
yp e
con
tains
sp ecic
information
ab out
eac
h
item
in
the
data
set
en
try
or
comp ound
data
set
en
try
in
the
le.
Eac
h
user
lab
el
is
128
w
ords
in
length
and
is
placed
in
the
le
as
follows:
----------------------------------------
|
reserved
for
existing
labels
|
0-9
----------------------------------------
|
last
item
description
label
|
10
----------------------------------------
|
item
description
label
|
11
----------------------------------------
|
item
description
label
|
12
----------------------------------------
|
first
item
description
label
|
13
----------------------------------------
|
global
information
label
|
14
----------------------------------------
|
data
|
|
|
----------------------------------------
SELF-DESCRIBING
FILES
E-1
Summary of Contents for QUERY
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Page 17: ...Figure 1 1 ORDERS Data Base Structure Figure 1 2 Sample Entry Values INTRODUCING QUERY V 1 7 ...
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Page 199: ...XEQ TF TOTAL DUE 9 SPACE B2 SKIP A TF R0 70 E2 S PURCH DATE END QUERY V COMMANDS 3 163 ...
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