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MARC 21

Exchange Schema Library openly published

The MARC formats are standards for the representation and communication of bibliographic and related information in machine-readable form....

Library of Congress, from their own meta description

Also in the API standards catalog

This standard shows up on both sides of the house — as a data model here, and as a standard applied in API operations. Same standard, two lenses.

See it as an API standard →

Other library data models

BIBFRAME Ontology / Vocabulary Dewey Decimal Classification (DDC) Code System GND (Integrated Authority File) Code System Library of Congress Classification (LCC) Code System Universal Decimal Classification (UDC) Code System VIAF (Virtual International Authority File) Code System
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Model Details
Steward Library of Congress
Origin United States national body
Layer Exchange Schema
Domain Library
Status live
Access Openly published
Go to the steward →
How I know this

Compiled for the API Evangelist data model catalog, then confirmed against the steward's own site.

Confirmed 2026-08-11

Evidence: name evidence 1/1. Found something wrong? Tell me — corrections are cheap and I would rather be right.

Modernity Profile
62.0 Modernizing
Access Open
Assessed 71.0% of the rubric

A separate measure from the Kin Score, which rates API providers. This rates how current a standard is in how it is expressed, published and paid for — not how good it is. EDIFACT and X12 score low here and move an enormous share of world trade.

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