Form subdivisions are used to indicate that a certain type of material is involved. These include headings which indicate the orientation of the work, such as --Bibliography; --Biography, or --Congresses. But they may also include the media used for the work, such as --Software, --Atlases or --Telephone directories.
The USMARC format has been updated to specify the use of the subfield code |v for these types of subdivisions; however the Library of Congress has not yet implemented this change. Once LC has made the switch, Queen's will follow. Until then, the subfield code |x will continue to be used.
Authority records may be constructed for subject heading + form subject subdivision combinations. An example appears below:
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 n IP a RULES n 010: : |a sh 85139910 040: : |a DLC |c DLC 151: 0: |a United States |x Bibliography 681/1: : |i Notes under |a Bibliography; Bibliography, National
Much more commonly, they are authorized because they appear on the list of Free-Floating Subdivisions.
The most complete information about free-floating form subdivisions is available from the Subject cataloging manual : subject headings. Within the lists provided in this reference source, form subdivisions are indicated by the presence of a diamond symbol in the margin.
The document Freefloating Form Subdivisions also provides a listing.
Frame background, bullets and lines for this section from Jelane's Free Web Graphics at "http://www.erinet.com/jelane/"