The Singapore LGBT encyclopaedia Wiki
Register
Advertisement

(OCoLC) is the prefix to the OCLC control number in field 035 ‡a.

It is applied in data sync processing which uses preprocessing routines to map existing OCLC control numbers to field 035 $.

Data sync uses OCLC control numbers in records in the following ways:

Match WorldCat records

Link local records from local systems to WorldCat records

Because the format of OCLC control numbers has changed over many years and many local systems remove it or put it in a field other than 035, OCLC batch services uses preprocessing routines to map existing OCLC control numbers to field 035 $a, prefixed with (OCoLC).

The following table describes the changes in OCLC control numbers formatting and location over time. Records can contain any of these formats and locations for the OCLC number.

Description Format Examples The OCLC control number in field 001 is prefixed by ocm, ocn, or on. OCLC numbers 1 through 99999999:

Have an ocm prefix Composed of 8 digits, right justified, with leading zero Followed by a blank OCLC numbers 100000000 and higher:

Have an ocn prefix Composed of 9 digits OCLC numbers 1000000000 and higher:

Have an on prefix Composed of 10 or more digits ocm00012345

ocn123456789

on1345345345 The OCLC control number in field 035 ‡a is prefixed by (OCoLC). OCLC number is a variable-length numeric string with no leading zeros. (OCoLC)198765401

Note: Field 019 contains the OCLC control number of a deleted or merged record replaced by the current one.

See also[]

References[]

Advertisement