MARC 21 Concise Format for Classification Data: 686: Relationship to Source Note (Network Development and MARC Standards Office, Library of Congress)

Information about the relationship of a number to the source edition when the number is different from the standard number for the same topic in the primary source edition. This field is used for numbers based on a source other than the primary source, expansions, implemented options, and adaptations. The information in this field is intended primarily for computer processing or to guide classifiers and is often not written in a form adequate for public user display.

First - Type of relationship

0 - Number from other source edition

1 - Expansion

2 - Option

3 - Adaptation, other

$a - Number in edition described in field 084--single number or beginning number of span (R)

Classification number in the edition described in field 084 for the topic identified in subfield $t.

$b - Number in primary source edition--single number or beginning number of span (R)

Standard number in the primary source edition for the topic identified in subfield $t, or if there is no subfield $t, then in subfield $j or field 153.

$c - Ending number of span (R)

$i - Explanatory text (R)

Explains the scope of the classification number. This subfield is repeated when other subfields intervene in the explanatory text.

$o - Number where instructions are found--single number or beginning number of span (R)

Number in the source edition where instructions are given for the option that is being implemented in the number in field 153. The subfield is used only for an option described in the primary source edition or another source edition (indicator value 2).

$t - Topic (R)

Topic that is being added to or subtracted from the meaning of the number in field 153.

$y - Table sequence number for internal subarrangement or add table (R)

$z - Table identification (R)

$2 - Edition identifier (R)

Edition number, date, or other textual designation of the classification scheme edition used as the source for the classification number in field 153 when that source is not the primary source.

$5 - Institution to which field applies (R)

See the description of this subfield in Appendix A: Control Subfields.

$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.


686	0#$221
686	1#$z2$b4541
686	2#$o229.22
686	2#$b494.352$o410
686	3#$tComprehensive works and European portion of Istanbul province$z2$b49618
686	3#$tAsian portion of Istanbul province$z2$b563
686	3#$tPizza$b641.824

686 - Relationship to Source Note (R)