Wikibase allows exporting data in RDF format. See details of the implementation in:
https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format

Changes to the RDF mapping are however subject to the Stable Interface Policy,
see <https://www.wikidata.org/wiki/Wikidata:Stable_Interface_Policy>.

Change log
----------
The following are the RDF format versions, see FORMAT_VERSION in RdfVocabulary.php:

0.0.1 - Initial implementation
0.0.2 - Changed WKT coordinate order (see T130049)
0.0.3 - Added page props option to wdata: (see T129046)
0.0.4 - Added unit conversion & normalization support (see T117031)
0.0.5 - Added quantities without bounds (see T115269)
0.1.0 - Changed sitelink encoding (see T131960)