Merge pull request #1734 from OpenEnergyPlatform/feature-release-note…

…-changelog

Extend CHANGELOG.md with a draft for a 2.0.0 release note

CHANGELOG.md

@@ -4,7 +4,19 @@ All notable changes to this project will be documented in this file.
 The format is inspired from [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and the versioning aims to respect [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [1.X.X] - 20XX-XX-XX
+## [2.0.0] - 2023-10-24
+
+### Major stuctural changes
+For the version 2.0.0 we especially did some major stuctural changes on the OEO. Two new modules were introduced:
+* The first one, oeo-sector, is a module on the same hierarchical level as the other content-related modules, i.e. oeo-physical, oeo-model and oeo-social. All sector-related entities were moved there from oeo-social.
+* The second one, oeo-shared-axioms, is a module that imports the four content-related modules and contains all axioms that are introduced across modules.
+
+This caused a lot of movement of entities, especially from oeo-shared. Many classes were moved back to their original module. This restructuring was done to foster the modularity, which makes the implementation easier and more error-prone. Yet, we had to break with the rule, that all axioms should live in the same module as their class of declaration. The full axiomatisation of a class is now only provided if the module oeo-shared-axioms is used. See also the wiki article on the [modules of the OEO](https://github.com/OpenEnergyPlatform/ontology/wiki/Modules-of-the-OEO).
+
+Further, the import process for UO and OMO were updated. All scripts and tools not essential for the building routine moved to a [seperate repository](https://github.com/OpenEnergyPlatform/oeo-tools). And finally, english language labels were added to (english) definitions and labels, to allow other language extentions in the future.
+
+### Content-related changes
+We added a lot of classes that are relevant for the OEKG development, i.e. technologies (#1572) and descriptors for scenario studies (#https://github.com/OpenEnergyPlatform/oekg/issues/19).
 
 ### Added
 - heat generation technology, solar heat technology, geothermal heat technology (#1610)