how to query RDF with SPARQL enhancing efficient search?

Question

my project is about enabling the user to enter the query and the best results are to be displayed to the user.this is my RDF file

<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:foaf="http://www.xmlns.com/foaf/0.1">

    <rdf:Description>
    <foaf:name>interview</foaf:name>
    <foaf:url>urlname1</foaf:url>
    </rdf:Description>

    <rdf:Description>
    <foaf:name>technical</foaf:name>
    <foaf:url>urlname2</foaf:url>
    </rdf:Description>  </rdf:RDF>

now if the user enters "technical questions",i coded in the way to take "technical" and "questions" in a array and to dynamically generate a SPARQL query so my query will look like

String queryString = "PREFIX rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns# " + "PREFIX foaf: http://www.xmlns.com/foaf/0.1 " + "SELECT ?url WHERE { ?a foaf:name ?name FILTER regex(?name,'"+ values[i]+"') ?a foaf:url ?url.}";

here values[i] is the array defined for "technical" and "questions".so this gives me an output as

------------- 
| url       |
============= 
| "urlname2"|
-------------

and when the user enters "interview questions" the result would be

------------- 
| url       |
============= 
| "urlname1"|
-------------

But if the user enters "technical interview questions" it gives me both as o/p like

 ------------- 
 | url       |
 ============= 
 | "urlname2"|
 -------------
 ------------- 
 | url       |
 ============= 
 | "urlname1"|
 -------------

but the o/p which i should get is only the first table that gives me url to prepare for technical questions(urlname2).can you please tell me how to alter my query/RDF format to get the desired o/p ? Thank you

Answer 1

The data doesn't mean what you think it does.

You have one object, with two different foaf:names.

Try converting the RDF/XML into Turtle or NTriples to get a clearer view of the data RDF/XML is very confusing.