# - Undefined
# - Undefined
|$i - Relationship information (R)
$v - Form subdivision (R)
$w - Control subfield (NR)
/0 - Special relationship
/1 - Tracing use restriction
/2 - Earlier form of heading
/3 - Reference display
|$x - General subdivision (R)
$y - Chronological subdivision (R)
$z - Geographic subdivision (R)
$0 - Record control number (R)
$4 - Relationship code (R)
$5 - Institution to which field applies (R)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)
Tracing for a geographic subdivision see also from reference.
Used in an established heading or established heading and subdivision record to trace a see also from reference from an authorized geographic subdivision to a related established heading.
Most of the content designators defined for field 581 are the same as those defined for field 181 (Heading-Geographic Subdivision), field 481 (See From Tracing-Geographic Subdivision), and field 781 (Subdivision Heading Linking Entry-Geographic Subdivision). Description, guidelines, and input conventions for shared content designators are given in the X81 Geographic Subdivisions-General Information section.
Guidelines for using subfield $w (Control subfield), subfield $i (Relationship information), and subfield $4 (Relationship code) in field 581 are given in the Tracings and References-General Information section.