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768 - Citation and Preference Order Instructions (R)

MARC 21 Classification - Concise

Note or table with instructions about the order in which elements are to be applied in synthesizing a classification number or instructions about preference for the classification of different characteristics of a topic.

First - Type of instruction
0 - Citation and preference order note
1 - Table of preference
Second - Undefined
# - Undefined
Subfield Codes
$a - Classification number-Single number or beginning number of span (R)
$c - Classification number-Ending number of span (R)
$e - Example class number (R)
$i - Explanatory text (R)
$j - Caption (R)
Caption for the immediately following classification number in a table of preference. This caption usually matches the caption in field 153 (Classification Number) for that classification number.
$n - Negative example class number (R)
Example of the incorrect classification number for the topic used to illustrate the citation and preference order instruction.
$t - Topic used as example of citation and preference order instruction (R)
$x - Exception to table of preference (R)
$y - Table sequence number for internal subarrangement or add table (R)
$z - Table identification-Table number (R)
$6 - Linkage (NR)
See the description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number (NR)
See the description of this subfield in Appendix A: Control Subfields.
768 0#$81.1$iGive priority in notation to the continent, country, locality emphasized. If emphasis is equal, give priority to the one coming first in Table 2
768 0#$iObserve table of preference under$a800
768 0#$iUnless other instructions are given, class a subject with aspects in two or more subdivisions of$a641.563$iin the number coming first, e.g.,$tlow-carbohydrate, low-calorie cooking for persons with diabetes$e641.56314$i(not$n641.5635$ior$n 641.5638)
768 1#$81.3$jLabor force by personal characteristics$a331.3$c331.6
768 1#$81.7$jLabor by industry and occupation$a331.7$x(except$a331.702)
768 1#$81.1$iUnless other instructions are given, observe the following table of preference, e.g.,$tlanguage and communication in education and research$z1$e07$i(not$z1$n014):
768 1#$81.2$jSpecial topics$z1$a04
768 1#$81.7$jManagement$z1$a068
768 1#$81.16$jTreatment by specific continents, countries, localities; extraterrestrial worlds$z1$a093$c099....

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