Canon Cat Reference Manual page 94

Numeric
fields
are sorted
according
to
their numeric
value,
not the number
of digits
they
have. The Cat
is
smart
enough
to
sort
all numbers, including those
with
negative
signs and
decimal
points,
as
shown
in
the example
below:
Before Sorting
After
Sorting
Before sorting
After
sorting
嬌
■ ■ 十
■
=
￨－
￨￨￨－
￨●
■
協 1続
￨
■
￨
守
￨■
莉
"
Numbers and Letters in the
Same
Field
The Cat can also sort
fields that contain mixtures
of
numbers and letters. These
fields
are
sorted by
dividing the
field into smaller pieces called
subfields.
A
subfield is
a
part
of text containing all letters or
all numbers. The
Cat
then sorts the alphabetic subfields
alphabetically and the
numeric subfields
numerically from left to
right,
as
shown
in
the examples
below:
赫
"
燎 .－
1
警
笏
￨
■
.IⅢ
Ⅲ で 当