• The use
of
braces denotes choices,
one
of
which must
be
selected.
Example:
The
representation:
indicates
that
you must specify either A,
or
B,
or
C.
If
a
list of choices is enclosed by neither brackets
or
braces,
it is to
be
treated
as if enclosed by braces.
The
use
of
brackets denotes choices,
one
of
which
may
be
selected.
Example:
The
representation:
indicates
that
you may
enter
A, B,
or
C,
or
you may
omit
the
field.
In
instances where there are nested braces
or
brackets
on
the
text
lines, the following rule applies: nested
operand
selection is dependent upon
the
selection
of
the
operand
of
a higher level
of
nesting.
Example:
Level 1 Level 2 Level 3
[filename
[fi
letype
[filemode]]]
where
the
highest level
of
nesting is
the
operand
that
is
enclosed
in
only
one
pair
of
brackets
and
the lowest level
of
nesting is
the
operand
that
is enclosed
by
the
maximum number
of
brackets. Thus,
in
the
previous
example,
the
user has the option of selecting a file
by
Chapter 7.
VM/PC
Commands
7-5
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