You can query it with Datalog (the source, not the read-only static web-site now shared). To my knowledge, there is still no good wiki tool supported by SPARQL. I'm hoping LinkedDataHub, or a new version of SME or Kanopi, will support that.
(I have tested a dozen tools but I might have missed something. Please suggest if you know something, that has similar functionality and is queryable with SPARQL)
Anyway, this started just as a reference resource to a SPARQL training course which then I decided to share publically. Block-level referencing, open-source, and ease of publication drove the tool selection.