Open Archives API

This documentation describes version 1.0 of the Open Archives API. The methods marked with an asterisk (*) require an API key, contact Open Archives to apply for one. All output is in UTF-8 and cached (server-side and via max-age header) for a day, unless otherwise specified.


  • Search - searches the genealogical data set and returns the found persons (and records)
  • Show - shows one specific genealogical record
  • Years ago - lists people born years ago


  • Add (*) - adds a link between record and page in online family tree
  • Delete (*) - deletes a link between record and page in online family tree
  • List - lists links between records and pages in online family trees


  • Add (*) - adds a comment to a record
  • Delete (*) - deletes a comment
  • List - lists comments made on records



  • Weather - historical weather measurements
  • Census - information about the Dutch population

Want to harvest the genealogical data?

Open Archives also provides an OAI-PMH data provider for harvesting.

Want to search for more open culture data?

Open Cultuur Data provides a API to a growing set of open datasets from archives and museums. The Open Archives dataset is also included in this Open Cultuur Data API.

What is an API?

An application-programming interface (API) is a set of programming instructions and standards for accessing a Web-based software application or Web tool. An organisation releases its API to the public so that other software developers can design products that are powered by its service.

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