The record directory consists of a series of fixed-length entries containing the tag, length, and starting character position of each control and variable field in the record. A field terminator ends the record directory. Each entry is 12 bytes.
The starting position is expressed as the byte offset from the first character following the record directory field terminator.
In OCLC-MARC Records, any element, value, field, subfield, etc., marked obsolete is no longer valid. Current records will not contain these invalid codes. However, previously exported records may contain obsolete MARC coding.
Ind = Indicator | SFC = Subfield code | R = Repeatable | NR = Nonrepeatable | = Blank
Starting Character Position
Tag Field Length Starting Character Position
001 0013 00000
005 0016 00018
100 0040 00075