This documentation describes the Open Archives API.
Records presented on Open Archives all have an URI. This URI resolves to content based on Content Negotiation (by profile).
Open Archives shares all the data in downloadable file exports (in CSV, XML and RDF).
Open Archives provides search results as defined by the Open Search specification. There's an OpenSearch description document for each language: NL, EN, DE & FR.
Open Archives also provides an OAI-PMH data provider for harvesting.
Find your ancestors and publish your family tree on Genealogy Online via https://www.genealogieonline.nl/en/