2024 March 13
Subject codes, incomplete and unreliable, have got to go
Subject classifications have been available via the REST API for many years but have not been complete or reliable from the start and will soon be deprecated. The subject metadata element was born out of a Labs experiment intended to enrich the metadata returned via Crossref Metadata Search with All Subject Journal Classification codes from Scopus. This feature was developed when the REST API was still fairly new, and we now recognize that the initial implementation worked its way into the service prematurely.
