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A MARC (MAchine-Readable Cataloging) record is the structured bibliographic data format libraries use to describe a catalog item such as a book, journal, or e-resource. MARC21, the current standard adopted in 1999 to replace USMARC and CAN/MARC, encodes data in 3-digit field tags (245 = Title, 100 = Main Author, 020 = ISBN).
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A cataloger either creates a new MARC record from scratch or imports one from a shared source. Each field is identified by a 3-digit tag and broken into subfields delimited by subfield codes (for example, $a, $b, $c). The 245 field holds the title statement, 100 captures the main author entry, 020 stores the ISBN, and 650 carries topical subject headings. Classification fields hold Library of Congress Classification (LCC) or Dewey Decimal numbers. Once written, the record is exported via the Z39.50 protocol so peer libraries can harvest it, ingested by the local Integrated Library System (ILS), and indexed for retrieval through the OPAC (Online Public Access Catalog). Vendors and authority files such as Library of Congress Subject Headings enrich the record with controlled vocabulary.
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MARC is the global interoperability standard for library cataloging, making it the default expectation in school, college, and university libraries worldwide. Encoding holdings in MARC21 means a record created once can be shared across institutions, supporting inter-library loan (ILL) workflows where patrons request items held elsewhere. Schools rely on copy-cataloging from the Library of Congress and OCLC WorldCat to avoid recreating bibliographic data already produced by a member library, which cuts cataloging time substantially. Accreditation bodies and consortia memberships also expect MARC compliance as a baseline for resource sharing, union catalogs, and federated discovery. Without MARC, a school library cannot participate in shared catalogs, contribute to WorldCat, or exchange holdings data with academic partners.
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- 3-digit field tags for fixed and variable fields (008 fixed-length data elements, 020 ISBN, 100 main author, 245 title, 650 subject headings)
- Subfield codes that segment each field into discrete data elements (for example, $a title proper, $b remainder of title)
- Authority records that control name, subject, and series headings for consistency across the catalog
- Z39.50 interchange protocol for record export, harvesting, and federated search across libraries
- Vendor enrichment from Library of Congress and OCLC WorldCat covering classification, subject, and holdings data
- BIBFRAME compatibility, allowing MARC data to be transformed into the linked-data successor format
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What is the difference between MARC21 and BIBFRAME?
MARC21 is the current ISO 2709 record-based format libraries have used since 1999. BIBFRAME is the Library of Congress's RDF/linked-data successor, designed to express bibliographic data as graphs of Works, Instances, and Items rather than as flat records. Most libraries still publish in MARC21 while piloting BIBFRAME transformations.
How is MARC different from Dublin Core?
MARC is a full bibliographic format with hundreds of fields, designed for professional cataloging. Dublin Core is a simpler 15-element metadata set (title, creator, subject, description, etc.) used for general digital-object description, repositories, and web resources where full MARC detail is unnecessary.
What is copy-cataloging via OCLC?
Copy-cataloging is the practice of downloading an existing MARC record from a shared bibliographic database such as OCLC WorldCat or the Library of Congress catalog, then importing it into the local ILS. The cataloger reviews and lightly edits the record rather than authoring it from scratch.
How does MARC relate to RDA cataloging rules?
RDA (Resource Description and Access) is the content standard that specifies what data to record and how to phrase it. MARC21 is the encoding format that carries that content. A library following RDA enters RDA-compliant data into MARC fields, and many systems are now transitioning toward RDA-aligned BIBFRAME output.
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