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More metadata for machines: citations, relations, preprints arrive in the REST API

Over the past few months we have been adding to the content and functionality of our REST API, Crossref’s free-to-use machine interface to the metadata for all 90 million+ registered DOIs. Much of the work focused on a review and upgrade of the API’s code and architecture in order to better support its rapidly growing usage, but we have also extended the types of metadata that the API can deliver.

This is a companion discussion topic for the original entry at