Topical Subdivisions

Introduction

Topical subdivisions are used to make a subject heading more specific. The subject heading will be established on its own, and another authority record will be established for the subject heading together with the subject subdivision.

Each subdivision is preceded by a |x subfield code.

The exceptions to this practice will be dealt with in the documents on Free-Floating Subdivisions and Pattern Headings.

Example

 DL FMT A RT z DT 04/04/98 R/DT 04/04/98 STAT ln E/L n
 SRC   LANG ??? ROM ? MOD   UNIQUE n GOVT ? S/SYS a D/I ? SUBD ? NUM n S/TYP n
 NAME b SUBJ c SER b KIND a H/ESTAB a T/EVAL b IP a RULES n

 010:  : |a sh 85064446
 040:  : |a DLC |c DLC |d DLC
 053/1:  : |a TA1637
 150: 0: |a Image processing
 450/1: 0: |a Pictorial data processing
 450/2: 0: |a Picture processing
 450/3: 0: |a Processing, Image
 550/1: 0: |w g |a Imaging systems
 550/2: 0: |w g |a Optical data processing

 DL FMT A RT z DT 04/04/98 R/DT none    STAT ln E/L n
 SRC   LANG ??? ROM ? MOD   UNIQUE n GOVT ? S/SYS a D/I ? SUBD ? NUM n S/TYP n
 NAME b SUBJ c SER b KIND a H/ESTAB a T/EVAL b IP a RULES n

010:  : |a sh 85064447
040:  : |a DLC |c DLC
150: 0: |a Image processing |x Digital techniques
450/1: 0: |a Digital image processing
550/1: 0: |w g |a Digital electronics

Both authority records should be present, and both should be coded c in the SUBJ subfield of the 008 field.

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Searching for Subdivisions

You may search for the subject + subject subdivision authority record directly by entering the command:

Remember that if your search retrieves no hits, it is a good idea to recheck the search by shortening the search string.

If a subject heading + subject subdivision authority record is not found, remember that the combination may be authorized because the subdivision is free-floating, or because it is authorized through a pattern heading. These will be dealt with in the documents on Free-Floating Subdivisions and Pattern Headings.

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