- Each record represents an entry in the DDC schedules or tables or a built number synthesized according to instructions in the schedules and/or tables.
- Each record contains a DDC number, a caption (heading) describing the class (subject) that the number represents, a representation of the class number’s position in the DDC hierarchy, and term(s) from the DDC Relative Index.
- Records often include one or more notes explaining the correct application of the class number.
- Records include terminology associated with the number from Library of Congress subject headings and/or MESH headings.
- If a DDC number can be segmented (i.e., truncated at a logical break), the segmented form of the number is shown at the top of the record, immediately below the class number or table number.
|DDC Number||See the following table DDC number types for details.|
|Relative Index Terms||
|LC Subject Headings||
|MeSH Terms||National Library of Medicine subject headings associated with the DDC class number in the record.|
DDC number types
|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 numbered auxiliary tables (Tables 1–6; in the Abridged Edition, Tables 1–4). 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.|
|Table centered entry||T2--4- T2--9||Number used to indicate and relate structurally a span of table numbers that together form a single concept.|
|Add table notation||617:028||Number for an entry in one of the DDC add tables (lists of special notation found in add notes under specific numbers throughout the schedules and occasionally in Tables 1–6). What precedes colon is class number or span where add table is located; what follows colon is notation to be added. Provides notation that can be added to other numbers, as instructed at the beginning of the add table, to make a class number appropriately specific to the work being classified.|
|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).|
Use associated LC subject headings
- In the WebDewey record, scroll down to view the Terms section or click the Terms button.
- Under LC Subject Headings, find the heading(s) applicable to the item you are classifying.
- Click the hyperlinked heading to display the LC subject authority record for the heading. The authority record appears in a new browser window.
- Review the authority record to verify that the heading is suitable for the bibliographic record you are creating/modifying.
- (Optional) Copy and paste the heading from the subject authority record to a bibliographic record.
- In the authority record, select the text of the heading. Right-click the text. On the popup menu, click Copy.
- In the main window, display the bibliographic record in a template edit view. Right-click in the field where you want to insert the heading. On the popup menu, click Paste.
- Control the heading. In the list, click Control Heading.
Use associated terms from DDC Relative Index
The Relative Index terms associated with a WebDewey record provide an at-a-glance view of other terminology associated with a class number.
The Notes section of the WebDewey record may include cross-references to related class numbers, table numbers, instructions, or manual entries within WebDewey.
To follow a cross-reference, click the hyperlinked DDC number. If the cited record is for a manual entry, it appears in a new browser window; otherwise, the hyperlinked record replaces the record in the current browser window.