OCLC Local Holdings Format and Standards is a guide to Local Holdings records in WorldCat. It provides tagging conventions, input standards and guidelines for entering information into WorldCat.
This edition supersedes the Local Holdings information in this technical bulletin: TB-258 OCLC-MARC Format Update 2010.
The examples provided are illustrative, not prescriptive. Do not take the examples or the form in which they are presented as instructions. Because of the dynamic nature of WorldCat, some examples may not appear online now as shown in the document.
(R) identifies a field or subfield as repeatable, which means it may occur more than once.
A repeatable field may occur more than once in a record.
A repeatable subfield may occur more than once in a field.
(NR) identifies the field or subfield as nonrepeatable. Fields or subfields are nonrepeatable for a variety of reasons:
The data element may occur no more than once for a given item.
The data element may occur more than once, but you enter multiple data elements in the same subfield.
The data element may occur more than once, but you enter multiple data elements in separate fields.
Some fields, subfields, elements or values may be marked Obsolete. Do not use. Although some records in WorldCat may still contain this coding, do not use these fields, subfields, elements or values in current cataloging.
Additionally, some fields, subfields, elements or values have been completely removed from the online system. They are considered as invalid. Descriptive information has been removed from this document.
OCLC acknowledges the efforts of all the people who participated in producing OCLC Local Holdings Format and Standards.
Judy Murran and Myrtle Myers
Joanne Murphy, Judy Murran and Myrtle Myers
Subject matter experts
Mela Kircher, Judy Murran and Myrtle Myers
Production and technical development
Joanne Murphy and Lorna Williamson
OCLC Local Holdings Format and Standards is based on the MARC21 Format for Holdings Data, published by the Network Development and MARC Standards Office of the Library of Congress.