Hi Mark Did you connect virtuoso with fuseki or you just import data into fuseki ?
> On Aug 22, 2015, at 2:56 AM, Mark Feblowitz <[email protected]> wrote: > > This seems like it should be a FAQ, but I’m not finding anything useful. > > I’m using SPARQL to explore linked data, which includes discovering > predicates. My understanding was that I could bind a subject and use > variables for predicate and object. > > It’s important to note that what I’m experiencing is when using dbpedia, > which is built on Virtuoso - perhaps my question should be posted elsewhere? > But I am doing this via a Fuseki endpoint, so there’s at least some relevance > :-? > > Here’s what I’m trying to do: > > I have some queries to a Fuseki endpoint that call out to dbpedia using > SERVICE blocks. Before entering the service I bind a value for ?Player, and > then with the service I pose the query; > >> PREFIX do: <http://dbpedia.org/ontology/> > ... >> {SELECT DISTINCT * where { >> ?Player a do:BasketballPlayer. >> ?Player ?r ?A. >> ?Player2 ?r ?A } > > I expected to find a binding for ?r as do:team. And when I pre-bind ?r to > that, I see plenty of bindings for ?A and ?Player2. The one binding that I do > see when leaving ?r unbound is > >> http://www.w3.org/1999/02/22-rdf-syntax-ns#type > > (I notice that dbpedia virtuso is limited - it cannot handle a BIND > statement.) > > Is the case am I seeing universal behavior or behavior specific to virtuoso? > Either way, are there clever workarounds? > > I do know that I can “white-list in” some bindings for ?r, using a VALUES > statement. But that pretty much defeats the discovery purpose. Also, as this > is varied and often schema-less content, I can’t rely on an ontology as a > guide to defined predicates. > > Any suggestions? > > Thanks, > > Mark >
