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this version is basically v1.1 with small fixes (see below) and an improved/clearer text
the major version change to 2.0 was required by the OGC to be officially approved
Changed
GenericCityObject is back as a City Object in the data model, because it makes life easy for everyone and it is there in the v3.0 data model (albeit those are specific to the SPACES, which are not implemented in CityJSON)
it is now possible to define extra Semantic Surfaces in Extensions (with "extraSemanticSurfaces"), which is a mandatory property of the schema
"metadata/pointOfContact" is now a JSON object, like other addresses for Buildings/Bridges
the text of the specs has been improved and harmonised (there were some inconsistencies, for instance with addresses for City Objects and metadata)
the values of u and v for textures are allowed to be outside [0.0, 1.0] to allow repeated patterns.