686 - Relationship to Source Note (R)
MARC 21 Classification - Concise
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
Second - Undefined
# - Undefined
$a - Number in edition described in field 084--single number or beginning number of
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
$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)
$8 - Field link and sequence number (NR)
||3#$tComprehensive works and European portion of Istanbul
||3#$tAsian portion of Istanbul province$z2$b563