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Universal Decimal Classification (UDC)

Code System Library licence required

Antonietta Folino. Alle origini della Classificazione Decimale Universale: la corrispondenza tra Paul Otlet e Melvil Dewey [On the origins of Universal Decimal Classification: correspondence between Paul Otlet and Melvil Dewey]. Editrice Bibliographica, 2024 [Italian]

UDC Consortium, from their own opening paragraph

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 MARC 21 Exchange Schema VIAF (Virtual International Authority File) Code System
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Model Details
Steward UDC Consortium
Layer Code System
Domain Library
Status live
Access Licence required
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How I know this

Promoted from the public BARTOC registry, then confirmed against the steward's own site.

Confirmed 2026-08-11

Evidence: name evidence 4/4. Found something wrong? Tell me — corrections are cheap and I would rather be right.

Modernity Profile
Access Enclosed
Assessed 53.0% of the rubric

Not enough of this standard was readable to place it in a band. That is a limit of what I could see, not a finding against the standard.

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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