Claim: Unlike UDC and DDC, 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. The BBC's Lonclass ("London Classification") is a subject classification system used internally at the BBC throughout its archives. There are 300,000 subject terms in the Lonclass vocabulary.