Subfield ‡8 contains data that identifies linked fields and may also propose a sequence for the linked fields. Subfield ‡8 may be repeated to link a field to more than one other group of fields.
The structure and syntax for the field link and sequence number subfield is: ‡8<linking number>.<sequence number>\<field link type>
The linking number is the first data element in the subfield and required if the subfield is used. It is a variable-length whole number that occurs in subfield ‡8 in all fields that are to be linked. Fields with the same linking number are considered linked. A linking number of "0" (zero) is not used in this field.
The sequence number is separated from the linking number by a period "." and may be optional. It is a variable-length whole number that may be used to indicate the relative order for display of the linked fields (lower sequence numbers displaying before higher ones).
The field link type is separated from preceding data by a reverse slash "\". It is a code indicating the reason for the link and it follows the link number or sequence number if present. The following one-character field link type code has been defined for use in subfield 8 in OCLC local holdings records:
a - Action
Code a is used in a record to link one or more fields with another field to which the processing or reference actions relate. This code is typically used only when there is more than one 5XX that relates to another 5XX field.
|541 || || ||‡81.1\a ‡3Public School and College Authority and Trade School and Junior College Authority project files ‡aFinance Dept ‡cTransferred |
|583 || || ||‡81.2\a ‡aAppraised ‡c198712- ‡ltjb/prr |
|583 || || ||‡81.3\a ‡aScheduled ‡c19880127 ‡ksrc/prr |
|583 || || ||‡81.4\a ‡aArranged ‡c19900619 ‡kmc/dmj |
|583 || || ||‡81.5\a ‡aProcessed level 2 ‡b90.160 ‡c19901218 ‡kmc/dmj |
Subfield ‡8 is always the first subfield in the field when it is used.