ICPSR Metadata Schema Version History

Date	Version	Note
April 11, 2025	v1.2	Updated field definitions to improve clarity.
June 28, 2024	v1.1	Removed guidance regarding null entries for National Institute of Justice studies. Several fields previously required "None" when otherwise a field would be left blank. Updated internal guidance for 'external source id' and 'funding purpose' elements. Added 'study number' and distributor 'order' elements to address earlier oversights.
Oct. 30, 2023	v1	Initial release and publication of the ICPSR Metadata Schema.