"Derived 035"

When a library cataloger adds a MARC bibliographic record to a Voyager database, either via bulk import (i.e., batch loads) or via the cataloging client, Voyager concatenates the 001 (control number) and the 003 (control number identifier) fields from the original MARC record, and creates an 035$a field in the copy of the record that Voyager loads.  Because the OCLC control number and prefix (such as "on1234567890") and the "(OCoLC)" come from the 001 and 003 fields respectively, this data element is sometimes referred to as the "derived 035." Voyager indexes this 035 tag and uses it for duplicate detection.

When viewed in the MARC record or in Voyager tables, the derived 035 appears as in the following examples.

(OCoLC) with “ocm”+ 8 digits + blank space (numbers shorter than 8 digits have leading zeros; ‘^’ represents the blank space that is included at the end of numbers that are 8 digits or fewer):

035 $a (OCoLC)ocm00456789^
035 $a (OCoLC)ocm61367139^

 (OCoLC) with “ocn” + 9 digits:

035 $a (OCoLC)ocn123456789

(OCoLC) with “on” + 10 or more digits:

035 $a (OCoLC)on1234567890
035 $a (OCoLC)on876987654321

"Second 035"

With the OCLC control number expansion to 9 digits on 11/12/2006, OCLC also began automatically generating a system number field (i.e., 035) that contained an unprefixed OCLC control number. This is sometimes referred to as the "second 035".  For example:

035 $a (OCoLC)456789
035 $a (OCoLC)87654321
035 $a (OCoLC)123456789
035 $a (OCoLC)3987654321

Note that these 035 fields lack the prefixes (“ocm”, “ocn”, “on”) found in the derived 035 fields, and that they do not include leading zeroes for numbers shorter than eight digits. When a library imports an OCLC record containing this format of the OCLC number, Voyager will retain this copy of the 035 along with the derived 035 from the 001 and 003 as noted above. Voyager will add this “second 035” to the indexes used for duplicate detection as well, if the number differs from what it finds in the derived 035: for instance, if the number lacks the leading zeros needed to have eight digits.

Indexing

When a bibliographic record enters a catalog, Voyager will attempt to normalize and add each 035 it finds into a left-anchored index for bib records. If the 035 contains the organization code OCoLC, or contains any of the OCLC designator prefixes (ocm, ocn, on), Voyager applies a specific normalization algorithm. Regardless of whether the 035 is "derived" or “second":

1. For the 0350 index on the fully qualified record number,
   • The index entry will begin with “OCOLC” followed by a blank space;
   • Any OCLC designator (ocm, ocn, on) will be removed;
   • The numeric portion of the number will complete the index entry.
2. For the 035A index on just the record number, the index entry will contain only the numeric portion of the record number.

Summary of suggested formatting:

(OCoLC)ocm01234567   (when the number of digits is less than 8, with leading zeroes so that the number of digits equals 8)

(OCoLC)ocm12345678   (when the number of digits is 8)

(OCoLC)ocn123456789   (when the number of digits is 9)

(OCoLC)on1023456789   (when the number of digits is 10 or more)

• Article last edited: 20-Jan-2021