FAQs: Character Prefix Dewey (CHAR_DEWEY) Sorting
The CHAR_DEWEY sort rule maps a single character to a two-digit numerical prefix that is added to the front of a DEWEY call number. This prefix is the primary sort key for the call number. After the prefix, the call number is sorted exactly as a Dewey call number.
| • | How Single Characters Map to a Two-Digit Numerical Prefix |
| • | CHAR_DEWEY Mapping Examples |
How Single Characters Map to a Two-Digit Numerical Prefix
The following table shows how the first character in a call number is mapped to a two-digit numerical prefix.
|
Single Character |
Mapped Two-Digit Prefix |
|
* |
00 |
|
o |
01 |
|
^ |
02 |
|
F |
03 |
|
S |
04 |
|
0 |
05 |
|
1 |
06 |
|
2 |
07 |
|
3 |
08 |
|
4 |
09 |
|
5 |
11 |
|
6 |
12 |
|
7 |
13 |
|
8 |
14 |
|
9 |
15 |
|
P |
16 |
|
R |
17 |
|
A |
18 |
|
B |
19 |
|
C |
20 |
|
D |
21 |
|
E |
22 |
|
G |
23 |
|
H |
24 |
|
I |
25 |
|
J |
26 |
|
K |
27 |
|
L |
28 |
|
M |
29 |
|
N |
30 |
|
Q |
31 |
|
T |
32 |
|
U |
33 |
|
V |
34 |
|
W |
35 |
|
X |
36 |
|
Y |
37 |
|
Z |
38 |
The following examples show how call numbers are mapped to create the CHAR_DEWEY shelving key.
| • | The call number is 823 BEA. The first character of the call number (8) maps to 14 in the CHAR_DEWEY sort mapping. The 14 is added as a prefix to the beginning of the call number, and the character position that originally held the 8 character is replaced with 0. The CHAR_DEWEY shelving key is 14 023 BEA. |
| • | The call number is *99 HOW. The first character of the call number (*) maps to 00 in the CHAR_DEWEY sort mapping. The 00 is added as a prefix to the beginning of the call number, and the character position that originally held the * character is replaced with 0. The CHAR_DEWEY shelving key is 00 099 HOW. |
| • | The call number is 79 HOW. The first character of the call number (7) maps to 13 in the CHAR_DEWEY sort mapping. The 13 is added as a prefix to the beginning of the call number, and the character position that originally held the 7 character is replaced with 0. Since the number following the prefix is to have three digits, another 0 is added before the remaining number, 9. The CHAR_DEWEY shelving key is 13 009 HOW. |
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