尝试通过我的Java程序查询dbpedia时发生bif：contain错误

问题描述

限时删除！！

该代码用于从Java程序查询dbpedia，然后在html页面中显示结果

the code is for querying dbpedia from java program and then displaying the result in html page

package jenaamem;

import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.query.ResultSetFormatter;
import com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP;

public class db2
{
static public void main(String...argv)
{
    try {
        String queryStr = "SELECT * WHERE{ ?s ?p ?o . ?o bif:contains' barack and obama and america' OPTION (score ?sc) } ORDER BY DESC (?sc) LIMIT 10 ";
        Query query = QueryFactory.create(queryStr);

        // Remote execution.
        QueryExecution qexec =   QueryExecutionFactory.sparqlService("http://dbpedia.org/sparql", query);
        // Set the DBpedia specific timeout.
        ((QueryEngineHTTP)qexec).addParam("timeout", "10000") ;

        // Execute.
        ResultSet rs = qexec.execSelect();
        ResultSetFormatter.out(System.out, rs, query);
        qexec.close();
    } catch (Exception e) {
    }


}

}

此处我在此代码中面临的问题是bif：contains显示错误，我什至尝试过然后我的问题仍在继续。

here the problem i am facing in this code is that bif:contains is showing error, i even tried then also my problem continues.

推荐答案

bif：contains 是带前缀的名称，但您还没有t为其定义了前缀，因此ARQ解析器会抛出错误，

bif:contains is a prefixed name but you haven't defined a prefix for it so the ARQ parser throws an error as it should

不幸的是， bif：contains 是一个Virtuoso特定的扩展名，实际上没有任何关联的前缀，因此您无法定义它。但是，您可以将其包含在< 和> 中，以便ARQ将其视为URI，Virtuoso仍然可以理解即在查询中使用< bif：contains> 。

Unfortunately bif:contains is a Virtuoso specific extension and doesn't actually have any associated prefix so you can't define it. However you can enclose it in < and > so that ARQ treats it like a URI and Virtuoso will still understand it i.e. use <bif:contains> in your query instead.

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