Question

我的sparql查询结果存在问题。这是我的问题：

String queryBody = "REGISTER QUERY noreasoning AS "
                    + "PREFIX ds:<http://www.dati.lombardia.it/resource/nf78-nj6b/> "

                    + "SELECT   ?idSensore ?valoreMisurazione ?tipologia ?nomeComune "

                    + "FROM STREAM <http://streamreasoning.org/streams/sensors> [RANGE 10s STEP 1s] "
                    + "FROM <http://streamreasoning.org/roomConnection> "                   

                    + "WHERE { "

                    + "?s ds:idsensore ?idSensore. "
                    + "?s ds:observes ?valoreMisurazione. "
                    + "?s ds:tipologia ?tipologia. "
                    + "?s ds:nomecomune ?nomeComune. "
                    +"  FILTER ( datatype(?tipologia) = xds:langString)\n"

                    + "} ";

我的结果是：

-------3 results at SystemTime=[1464188665959]--------
"2447"^^null    6   "Temperatura"^^null "Bema"^^null    
"8016"^^null    -1.3    "Temperatura"^^null "Aprica"^^null  
"4066"^^null    7.9 "Temperatura"^^null "Arconate"^^null

我应该更改什么才能删除＆＃34; ^^ null＆＃34;？

Jena中的数据类型结果SPARQL查询

0 个答案: