GQL Endpoint

The endpoint uses a property graph version of Wikidata. In particular, we took the Wikidata Truthy dump as included with the WDBench benchmark and converted some edges leading to literals into properties of an entity. The dataset is used for illustration purposes and we do not claim that this is the best way to model Wikidata as a property graph. A series of GQL-like queries are included in the Example section of the endpoint.

SPARQL Endpoint

Here we host the Wikidata Truthy dump as included with the WDBench benchmark in RDF format and provide query support via SPARQL. The novelty of this endpoint is that we extended the SPARQL semantics to allow returning paths that witness property path query answers. We do so under some of the semantics prescribed by GQL (namely ANY SHORTEST, ALL SHORTEST and SIMPLE). We remark that this requires departing slightly from the SPARQL 1.1 semantics when it comes to evaluating property path expressions as to not deal with the set/bag semantics issue when it comes to paths. Pinpointing the correct approach here is the subject of ongoing research and the endpoint serves as a suggestion on how returning paths could be achieved in SPARQL. As in the previous case, the endpoint includes several examples illustrating how our approach works.