EAD3 in Archives Portal Europe
As a result of a cooperation between the Archives Portal Europe Foundation (APEF) and the Dutch project Digitale Taken Rijk (DTR), APEF started looking into a potential use of EAD3 in 2017/2018. The DTR-project – launched and funded by the Dutch Ministry of Education, Culture and Science – was set up to build a digital infrastructure and service organisation for the Dutch National Archives (Nationaal Archief) and eleven Dutch Regional Historical Centers (RHC’s, i.e. former State Archives in the Dutch provinces) and the intention was to re-use Archives Portal Europe as an aggregator for finding aids in this context. In addition to this, the DTR-project asked APEF to also enable the ingestion of additional finding aids and to publish the information of these additional finding aids as 'open data' via its API together with the finding aids' information.
You can read all about EAD3 in general on the standard's homepage hosted by the Library of Congress.