You can't use variables in property paths, so ?p1/?p2
isn't a legal property path. You shouldn't be able to parse it as a legal query. As an alternative (which I'm not sure will work, but it might be worth investigating), you could use a ParameterizedSparqlString with "?s ?p1/?p2 ?o" as content and do substitutions on ?p1 and ?p2 in that, which would generate a legal query. I'm not sure whether the substitution would be performed before any parsing has to happen though (that's why I'm not *sure* that this would work). On Thu, Jul 14, 2016 at 12:47 PM, A. Soroka <[email protected]> wrote: > I don't quite see how this would cause the problem, but I do note that of the > three bindings in your code below, the first is _not_ to "s" (as you say in > your description), but to "o". > > --- > A. Soroka > The University of Virginia Library > >> On Jul 14, 2016, at 12:09 PM, Chris Jones <[email protected]> wrote: >> >> I'm building a simple query of the form "?s ?p1 / ?p2 ?o" and binding s, p1, >> and p2 using QuerySolutionMap. I get this error back: >> >> Exception in thread "main" org.apache.jena.query.QueryParseException: >> Encountered " "/" "/ "" at line 1, column 26. >> >> Here's the code that reproduces the error, using Jena 3.1.0: >> >> package org.cjones.test; >> >> import org.apache.jena.query.*; >> import org.apache.jena.rdf.model.ResourceFactory; >> import org.apache.jena.tdb.TDBFactory; >> >> public class Test { >> public static void main(String[] args) { >> Dataset dataset = TDBFactory.createDataset("db"); >> String queryStr ="select ?o where { ?s ?p1 / ?p2 ?o }"; >> QuerySolutionMap bindings =new QuerySolutionMap(); >> bindings.add("o", >> ResourceFactory.createResource("http://example.com/Alice";)); >> bindings.add("p1", >> ResourceFactory.createResource("http://example.com/boss";)); >> bindings.add("p2", >> ResourceFactory.createResource("http://example.com/givenName";)); >> dataset.begin(ReadWrite.READ); >> QueryExecution qe = QueryExecutionFactory.create(queryStr, dataset, >> bindings); >> ResultSet rs = qe.execSelect(); >> // ... dataset.end(); >> } >> } >> >> I don't think I'm doing anything wrong, am I? >> >> Chris >> > -- Joshua Taylor, http://www.cs.rpi.edu/~tayloj/
