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Apache SIS is an implementation of GeoAPI interfaces= , which is a project from the Open Geospatial Consortium (OGC). The cur= rent GeoAPI version is 3.0.2. The policy on GeoAPI versions is to be decide= d by OGC, but current roadmap envisions two nex= t versions: 3.1 and 4.0.
GeoAPI 3.1 would be a version fully backward compatible with GeoAPI = 3.0.2. If there is a demand for GeoAPI 3.2, 3.3, etc., all of them= would be backward compatible.
GeoAPI 4.0 would have some compatibility breaks with GeoAPI 3.x<= /em> line when it allows better leveraging of new standards. GeoAPI 4.1, 4.= 2, etc. would all be backward compatible with GeoAPI 4.0.
GeoAPI 5.0 may be created if some standards change in incompatible w= ay after GeoAPI 4.0 release (not currently planed).
Apache version lines follow the two GeoAPI lines as be= low:
Even after SIS 2.0 is released, we plan to continue to= maintain the SIS 1.x line for a few years. It would give some tim= e to users for migrating from GeoAPI 3.x to GeoAPI 4.x at= their convenience. Actually we are already doing that process for many yea= rs. The SIS "geoapi-4.0" branch is doing development on top of GeoAPI 4.0 d= evelopment branch, then the work is ported to master (which depends on GeoA= PI 3.0.1) from times to times. Currently only the SIS versions on top of Ge= oAPI 3.0.1 make the official SIS releases.
Apache SIS 1.4 has been released in October 2023. Next version will be 1= .5. Work planed for 1.5 release includes: