Claim: Unlike DDC and UDC (created in the late 19th century), which are widely used across the library community, Lonclass (with a vocabulary of 300,000 subject terms) has remained a BBC-internal system since its creation in the 1960s.
Evidence: Unlike UDC and DDC, which are widely used across the library community, Lonclass has remained a BBC-internal system since its creation in the 1960s. There are 300,000 subject terms in the Lonclass vocabulary. The UDC was developed by the Belgian bibliographers Paul Otlet and Henri La Fontaine at the end of the 19th century. The Dewey Decimal Classification (DDC), colloquially the Dewey Decimal System, is a proprietary library classification system first published in the United States by Melvil Dewey in 1876.