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Patrick Polischuk

Patrick joined Crossref in 2018 where he manages the REST API for metadata consumers. Previously he worked as a Senior Product Manager at PLOS, working on everything from manuscript submission systems to journal publishing platforms. Before making the jump to scholarly publishing Patrick worked on emerging technology policy in Washington, DC, where he earned an MA in International Science and Technology Policy from the George Washington University. In his spare time Patrick enjoys growing vegetables, backpacking in the mountains, and petting cats.

Read more about Patrick Polischuk on their team page.

Subject codes, incomplete and unreliable, have got to go

Patrick Polischuk

Patrick Polischuk – 2024 March 13

In MetadataAPIs

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. dfdfd 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.

2023 public data file now available with new and improved retrieval options

We have some exciting news for fans of big batches of metadata: this year’s public data file is now available. Like in years past, we’ve wrapped up all of our metadata records into a single download for those who want to get started using all Crossref metadata records. We’ve once again made this year’s public data file available via Academic Torrents, and in response to some feedback we’ve received from public data file users, we’ve taken a few additional steps to make accessing this 185 gb file a little easier.

2022 public data file of more than 134 million metadata records now available

In 2020 we released our first public data file, something we’ve turned into an annual affair supporting our commitment to the Principles of Open Scholarly Infrastructure (POSI). We’ve just posted the 2022 file, which can now be downloaded via torrent like in years past. We aim to publish these in the first quarter of each year, though as you may notice, we’re a little behind our intended schedule. The reason for this delay was that we wanted to make critical new metadata fields available, including resource URLs and titles with markup.

Behind the scenes improvements to the REST API

UPDATE, 24 August 2021: All pools have been migrated to the new Elasticsearch-backed API, which already appears to be more stable and performant than the outgoing Solr API. Please report any issues via our Crossref issue repository in Gitlab. UPDATE, 9 August 2021: The cutovers for the polite and Plus pools are delayed again. We’re still working to ensure acceptable performance and stability before serving responses from the new application and infrastructure.