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[求助]請問各位大大們___寫的SPARQL查詢怎麼會跑出這樣結果?? 請問各位大大們: try{             FileInputStream file=new FileInputStream("PeriodicTable.owl");             InputStreamReader in=new InputStreamReader(file,"UTF-8");             Model tempModel =ModelFactory.createDefaultModel();             tempModel.read(in,null);             "PREFIX table: <http://www.daml.org/2003/01/periodictable/PeriodicTable> "+                     "SELECT * " +                   "WHERE {" +                     "?element table:name ?name."+                     "?element table:symble ?symble."+                     "?element table:block ?block."+                     "OPTIONAL{?element table:color ?color.}"+                     "}"+                     "ORDER BY ?name";             Query query =QueryFactory.create(querytString);             QueryExecution qe=QueryExecutionFactory.create(query,tempModel);             ResultSet results=qe.execSelect();                                       ResultSetFormatter.out(System.out,results,query);                      qe.close();         }catch(IOException e){             e.printStackTrace();         } } PeriodicTable.owl: http://www.daml.org/2003/01/periodictable/PeriodicTable.owl 怎麼執行出來結果是這樣: ------------------------------------------- | element | name | symble | block | color | =========================================== ------------------------------------------- 都沒有跑出東西??   疑惑中!! [此贴子已经被作者于2007-8-30 19:16:17编辑过]    收藏   分享   顶(0)

	第2楼

name、symble等等这些属性的namespace不是<http://purl.org/dc/elements/1.1/>，而是http://www.daml.org/2003/01/periodictable/PeriodicTable

	第3楼

謝謝jpz6311whu提點,已經更改了<http://www.daml.org/2003/01/periodictable/PeriodicTable> 但怎麼還是一樣: ------------------------------------------- | element | name | symble | block | color | =========================================== -------------------------------------------

	第4楼

要加#号              PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>              PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

	第5楼

以解決了^^謝謝大大