Construct({ ?repositoryURL <http://rdfs.org/ns/void#triples> ?count .
           ?repositoryURL <http://www.w3.org/ns/activitystreams#object> ?revisionURL },
          Join(Project(Extend(Union(BGP( ?s ?p ?o), Graph(?g, BGP( ?s ?p ?o))),
                              ?count,
                              count(*) ),
                       {?count}),
               Project(Extend(Extend({ },
                                     ?repositoryURL,
                                     <http://dydra.com/sparql-functions#repository-url>()),
                              ?revisionURL,
                              <http://dydra.com/sparql-functions#repository-revision-url>()),
                       {?repositoryURL, ?revisionURL})))