semantic web - SPARQL query not inferencing properties after class specified -


i running test query on sparql test inferencing. query follows:

    prefix eem: <http://purl.org/eem#>     prefix ns: <http://purl.org/net/ns/>     prefix sc_data: <http://purl.org/net/ns/sc_data/>     prefix dbp: <http://dbpedia.org/resource/>     prefix dbpprop: <http://dbpedia.org/property/>     prefix ex: <http://www.example.org/rdf#>     select  ?roa     {     service <http://dbpedia.org/sparql>{     ex:vaccine dbp:polio_vaccine.     ex:vaccine dbpprop:routesofadministration ?roa. }     }

i no results query when trying @ snorql page. when specify polio vaccine, shouldn't automatically inherit properties specified vaccine? need change?

in original query, ex:vaccine uri node, short <http://www.example.org/rdf#vaccine>. it's very unlikely dbpedia contains information it. while dbpedia endpoint may (or may not) include information inferrable dbpedia data, doesn't treat sparql query part assertion , part query.

you're literally saying "find values of ?roa such ?roa route of administration of ex:vaccine , ex:vaccine instance of dbp:polio_vaccine". ex:vaccine constant though, it's kind of saying, "find factors of 10, , way, 10 sum of 3 , 4." "10 sum of 3 , 4" isn't in data, though, there won't matches, if there recorded factors of 10. on top of that, dbp:polio_vaccine individual in dbpedia, not class, there won't instance of it.

instead, want ask values of dbpprop:routesofadministation property individual dbpedia:polio_vaccine. query need here (i'm using prefixes defined @ http://dbpedia.org/sparql, public endpoint):

select ?routes {   dbpedia:polio_vaccine dbpprop:routesofadministration ?routes }

sparql results


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