Thank you very much! I will try to dig around it a little bit further:

2016-05-01 21:55 GMT+02:00 Stas Malyshev <smalyshev@wikimedia.org>:

That's not the original representation inside Wikibase
(that still has separate elements and can be also seen in the JSON dump)
and not the only RDF representation - there's also "full value"
representation, described here:
https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format#Globe_coordinate

Maybe you can tell me, why you have dropped the proposed altitude value from the datatype? How it exactly suppose to work with different coordinate systems (potentially at different celestial bodies)? And how can one specify the celestial body in WD? I can't see any interface for it there..

Thanks again

Jan