Since 12 October 2020, version 4 of the OOAPI is available.
The documentation of this new V4 can be found at: https://open-education-api.github.io/specification/v4/docs.html
The V4 OOAPI specification itself can be found at: https://github.com/open-education-api/specification/tree/master/v4
The proposal for this OOAPI V4 has come about with the help of feedback from the institutions on the use of the OOAPI V3 and by looking at the development of the IMS Global eduAPI.
With the V4 proposal, we believe we have taken an important step towards a clear and applicable model *) in which the educational components (programme, course, component) as well as the offering and the taking thereof (association) can be fully described.
*) See also this presentation (in Dutch only but the images are self-explanatory) : https://github.com/open-education-api/notulen/blob/master/2020/20200512/OOAPI%20v4%20-%20use%20cases%20-%20v20200512.pdf