Hi!
A quick search only returned those tables so far:
https://www.wikidata.org/wiki/Wikidata:List_of_properties/all
<mailto:wikidata@lists.wikimedia.org>
Any formal representation would work: OWL, etc.
There's basic OWL with Wikibase ontology here:
http://wikiba.se/ontology-1.0.owl
The properties can be found in the general dump (
https://dumps.wikimedia.org/wikidatawiki/entities/ )
described as outlined here:
https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format#Properties
There's no separate file, RDF, OWL or otherwise, with only properties,
AFAIK.
--
Stas Malyshev
smalyshev(a)wikimedia.org