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

Change log
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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)