| Description | Notes | |
|---|---|---|
| EN | UDC | Universal Decimal Classification |
| FR | CDU | Classification Décimale Universelle |
| ES | CDU – Completa | Código de la Clasificación Decimal Universal (CDU). Código |
List 27 · Subject scheme identifier
09 — UDC
<?xml version="1.0" encoding="UTF-8"?>
<Product xmlns="http://ns.editeur.org/onix/3.0/reference">
<DescriptiveDetail>
<Audience>
<AudienceCodeType>09</AudienceCodeType>
</Audience>
</DescriptiveDetail>
</Product>- Introduced in Issue 0 (or earlier)