Find the DDC number types WebDewey provides records for, including examples and descriptions.
WebDewey provides records for the following types of DDC numbers.
|Class number||004.67||Number or span of numbers provided in the DDC schedules to represent a subject.|
|Built class number||B 598.176||A number constructed according to add instructions stated or implied in the schedules or tables to represent a specific subdivision of a DDC class.|
|Centered entry||C 930-990||Represents a subject covered by a span of numbers.|
|Optional number||(921)||Number enclosed in parentheses; a class number that is an optional alternative to the number usually assigned to a concept.|
|Bracketed number|| Unassigned
511[.22] Intuitionistic mathematics
 Comparative religion
T5-- Persons of mixed ancestry with ethnic origins from more than one continent
|Number enclosed in square brackets; a number that has been discontinued or relocated, or an unassigned number.
Record instructs you not to use this number and provides a cross-reference to the correct class number.
|Table number||T1--071||Number for an entry in one of the DDC tables. Provides notation that can be added to other numbers to make a class number appropriately specific to the work being classified.|
|Built table number||T4--092||A number constructed according to add instructions stated or implied in the schedules or tables to represent a specific subdivision of a DDC table. ADD IMAGE|
|Table centered entry||T2--4-
|Number used to indicate and relate structurally a span of table numbers that together form a single concept.|
|Manual number||M 361-365||A number or range of numbers covered in an entry in the DDC Manual. The manual entry explains the proper use of the class number (or range). ADD IMAGE|