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SPARQL Working with Jena
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How to Check for Wellformed (syntactically correct) N3.
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package javajenatest; import import import import import import
com.hp.hpl.jena.rdf.model.InfModel; com.hp.hpl.jena.rdf.model.Model; com.hp.hpl.jena.rdf.model.ModelFactory; com.hp.hpl.jena.reasoner.ValidityReport; com.hp.hpl.jena.util.FileManager; java.util.Iterator;
/** * * @author Frank Coyle * Illustrates loading N3 and using a try-catch block to report errors * and cleanly terminate your program */ public class JenaSyntaxCheck { public static void main(String [] args) {
Model myRawModel = null; // define outside try-catch String urlString = "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3test/wilson.n3"; boolean isBadParse = false; //. assume it's ok, prove otherwise try { // Here we load from a public URL myRawModel = FileManager.get().loadModel(urlString, "N3"); } catch (Exception e) { System.out.println("EXCEPTION in parsing the N3.\n" + e.getMessage() + "\n at URL: " + urlString); isBadParse = true; } if (isBadParse) { System.out.println("Terminating program"); return; } // write the model to System.out (or any output stream) // if no 2nd parameter, the output is RDF/XML myRawModel.write(System.out, "N3"); // it's sometimews helpful to add a final print line just to see that // our processing has completed System.out.println("< -- Jena Done -->"); } }
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OUTPUT:
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SELECT
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ASK result is true ---------------
package jenasemweb;
import import import import import import import import import import import import import import
com.hp.hpl.jena.query.QueryExecution; com.hp.hpl.jena.query.QueryExecutionFactory; com.hp.hpl.jena.query.QueryFactory; com.hp.hpl.jena.query.QuerySolution; com.hp.hpl.jena.query.ResultSet; com.hp.hpl.jena.rdf.model.InfModel; com.hp.hpl.jena.rdf.model.Model; com.hp.hpl.jena.rdf.model.ModelFactory; com.hp.hpl.jena.rdf.model.Property; com.hp.hpl.jena.rdf.model.Resource; com.hp.hpl.jena.rdf.model.Statement; com.hp.hpl.jena.rdf.model.StmtIterator; com.hp.hpl.jena.util.FileManager; com.hp.hpl.jena.util.PrintUtil;
/** * * @author Frank Coyle * This program illustrates how one can use the SPARQL CONSTRUCT feature * as a rule system to create new triples. The new triples become a new model * that we add to our existing model which lets us execute queries that we * would not be able to execute without the new triple. */ public class SparqlQuery03 { public static void main(String [] args) { // LOAD Raw Model from URL Model myRawModel = FileManager.get().loadModel( "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/Houghland.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/cruz.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/abraham.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/akundi.v2.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/bennett.n3", "N3"); // READ another N3 into the Model
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FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/hanna.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/liew_hw2.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/ramani.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/rawal.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/sison.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/tara.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/turney.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/wilson.n3", "N3"); // Create an RDFS inference model from the Raw Model InfModel infmodel = ModelFactory.createRDFSModel(myRawModel); // Create a new SPARQL query String queryString = "PREFIX drc: " + "PREFIX rdf: " + "PREFIX foaf: " + "SELECT DISTINCT ?lname ?fname " + // space after last ?var "WHERE {" + " ?who foaf:lastName ?lname." + " ?who foaf:firstName ?fname." + " }" + "ORDER BY ?lname"; // create a Jena query from the queryString com.hp.hpl.jena.query.Query query = QueryFactory.create(queryString); // create a Jena QueryExecution object that knows the query // and the N3 over which the query will be run QueryExecution qe = QueryExecutionFactory.create(query, infmodel);
// execute the query - get back a ResultSet ResultSet results = qe.execSelect(); // iterate over the result set while(results.hasNext()) { QuerySolution sol = results.next(); System.out.println("Solution:" + sol.toString() ); }
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} } Output: Solution:( ?lname = "Abraham" ) ( ?fname = "Sherwin" ) Solution:( ?lname = "Bennett" ) ( ?fname = "Steve" ) Solution:( ?lname = "Bennett" ) ( ?fname = "Steven" ) Solution:( ?lname = "Collins"^^ ) ( ?fname = "Melanie"^^ ) Solution:( ?lname = "Connery" ) ( ?fname = "Sean" ) Solution:( ?lname = "Cook" ) ( ?fname = "Norman" ) Solution:( ?lname = "Cook" ) ( ?fname = "Quentin" ) Solution:( ?lname = "Coyle" ) ( ?fname = "Frank" ) Solution:( ?lname = "Coyle"^^ ) ( ?fname = "Frank"^^ ) Solution:( ?lname = "Cruz" ) ( ?fname = "Tegan" ) Solution:( ?lname = "Cruz" ) ( ?fname = "Roger" ) Solution:( ?lname = "De Niro" ) ( ?fname = "Robert" ) Solution:( ?lname = "De Niro" ) ( ?fname = "Robert"^^xsd:String ) Solution:( ?lname = "DiCaprio" ) ( ?fname = "Leonardo" ) Solution:( ?lname = "Hanna"^^ ) ( ?fname = "Michael" ) Solution:( ?lname = "Hanna"^^ ) ( ?fname = "Mike"^^ ) Solution:( ?lname = "Hougland" ) ( ?fname = "Jack" ) Solution:( ?lname = "Keaton" ) ( ?fname = "Michael" ) Solution:( ?lname = "Kilmer" ) ( ?fname = "Val" ) Solution:( ?lname = "Liew" ) ( ?fname = "Kar" ) Solution:( ?lname = "Lord"^^ ) ( ?fname = "Jack"^^ ) Solution:( ?lname = "Meyers" ) ( ?fname = "Michael" ) Solution:( ?lname = "Meyers" ) ( ?fname = "Mike" ) Solution:( ?lname = "Pfeiffer" ) ( ?fname = "Michelle" ) Solution:( ?lname = "Presley" ) ( ?fname = "Elvis" ) Solution:( ?lname = "Rawal" ) ( ?fname = "Ruchi"^^xsd:String ) Solution:( ?lname = "Roquebrune" ) ( ?fname = "Micheline" ) Solution:( ?lname = "Sison" ) ( ?fname = "Raymond" ) Solution:( ?lname = "Turney" ) ( ?fname = "Kyle" ) Solution:( ?lname = "Walken" ) ( ?fname = "Christopher" ) Solution:( ?lname = "Walken" ) ( ?fname = "Chris" ) Solution:( ?lname = "Walken" ) ( ?fname = "Georgianne" ) Solution:( ?lname = "Walken"^^ ) ( ?fname = "Georgianne"^^ ) Solution:( ?lname = "Walken"^^ ) ( ?fname = "Christopher"^^ ) Solution:( ?lname = "Wilson" ) ( ?fname = "Justin" ) Solution:( ?lname = "Wood" ) ( ?fname = "Natalie" )
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Hieu Tran's Directory Read Solution package jenasemweb; 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.rdf.model.InfModel; import com.hp.hpl.jena.rdf.model.Model; import com.hp.hpl.jena.rdf.model.ModelFactory; import com.hp.hpl.jena.query.QuerySolution; import com.hp.hpl.jena.rdf.model.Property; import com.hp.hpl.jena.rdf.model.Resource; import com.hp.hpl.jena.rdf.model.Statement; import com.hp.hpl.jena.rdf.model.StmtIterator; import com.hp.hpl.jena.util.FileManager; import com.hp.hpl.jena.util.PrintUtil; import java.net.*; import java.io.*; import java.util.*; /** * * @author Hieu Tran */ public class SparqlQueryFromMultiN3 { public static void main(String [] args) { String urlPath = "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/"; // create List of all the filenames in directory List fileNames = createListOfFilesFromDirectory(urlPath); if(!fileNames.isEmpty()) { // LOAD Raw Model from URL Model myRawModel = FileManager.get().loadModel(urlPath + fileNames.get(0),"N3"); for (int i=1; i< fileNames.size(); i++) { // READ another N3 into the Model try { FileManager.get().readModel(myRawModel, urlPath + fileNames.get(i), "N3"); } catch(Exception e) { System.out.println("Error read model:" + e.getMessage() + " "+ fileNames.get(i)); } } // Create an RDFS inference model from the Raw Model InfModel infmodel = ModelFactory.createRDFSModel(myRawModel); // Create a new SPARQL query String queryString = "PREFIX "PREFIX "prefix "prefix "prefix
: " + foaf: " + rdf: " + rdfs: " + foaf: " +
"prefix xsd: "prefix dc:
" + " +
"SELECT distinct ?firstName ?lastName ?age " + " ?person foaf:firstName ?firstName;" + " foaf:lastName ?lastName; " + " foaf:age ?age;" + " foaf:knows ?y. " + " ?y foaf:lastName ?ylastname ." + " FILTER (?age > 30 && ?ylastname = \"Walken\") ." + " } Order by (?firstname)";
"WHERE {" +
// create a Jena query from the queryString com.hp.hpl.jena.query.Query query = QueryFactory.create(queryString); // create a Jena QueryExecution object that knows the query // and the N3 over which the query will be run QueryExecution qe = QueryExecutionFactory.create(query, infmodel); // execute the query - get back a ResultSet ResultSet results = qe.execSelect(); // iterate over the result set while(results.hasNext()) { QuerySolution sol = (QuerySolution)results.next(); System.out.println("Solution:" + sol.toString() ); } } } /* Read the information from URL line by line, extract the file name from it, and store the file name into the list */ public static List createListOfFilesFromDirectory(String urlPath) { List fileNames =new ArrayList(); try { URL url = new URL(urlPath); URLConnection connection = url.openConnection(); connection.setDoInput(true); InputStream inStream = connection.getInputStream(); BufferedReader input = new BufferedReader(new InputStreamReader(inStream)); String line = ""; while ((line = input.readLine()) != null) String str = getFileName(line); if (!str.equals("")) { fileNames.add(str); } } } catch (Exception e) { System.out.println(e.toString()); } return fileNames; } /* Extract the n3 file name from the line. */ private static String getFileName(String str) { int i = str.indexOf(".n3");
{
if (i > 0) { str = str.substring(0, i+3); str = str.substring(str.lastIndexOf('\"')+1,str.length()); } else { str = ""; } return str; } } -------------- output run: Solution:( ?firstName Solution:( ?firstName Solution:( ?firstName Solution:( ?firstName
----------= = = =
"Georgianne" ) ( ?lastName = "Walken" ) ( ?age = 71 ) "Norman" ) ( ?lastName = "Cook" ) ( ?age = 46 ) "Quentin" ) ( ?lastName = "Cook" ) ( ?age = 46 ) "Sean" ) ( ?lastName = "Connery" ) ( ?age = 79 )
DESCRIBE package jenasemweb;
import import import import import import import import import import import import import import
com.hp.hpl.jena.query.QueryExecution; com.hp.hpl.jena.query.QueryExecutionFactory; com.hp.hpl.jena.query.QueryFactory; com.hp.hpl.jena.query.QuerySolution; com.hp.hpl.jena.query.ResultSet; com.hp.hpl.jena.rdf.model.InfModel; com.hp.hpl.jena.rdf.model.Model; com.hp.hpl.jena.rdf.model.ModelFactory; com.hp.hpl.jena.rdf.model.Property; com.hp.hpl.jena.rdf.model.Resource; com.hp.hpl.jena.rdf.model.Statement; com.hp.hpl.jena.rdf.model.StmtIterator; com.hp.hpl.jena.util.FileManager; com.hp.hpl.jena.util.PrintUtil;
/** * * @author Frank Coyle * This program illustrates how one can use the SPARQL CONSTRUCT feature * as a rule system to create new triples. The new triples become a new model * that we add to our existing model which lets us execute queries that we * would not be able to execute without the new triple. */ public class SparqlDescribe01 { public static void main(String [] args) { // LOAD Raw Model from URL Model myRawModel = FileManager.get().loadModel( "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/Houghland.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/cruz.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/abraham.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/akundi.v2.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/bennett.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/hanna.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/liew_hw2.n3", "N3");
// READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/ramani.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/rawal.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/sison.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/tara.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/turney.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/wilson.n3", "N3"); // Create an RDFS inference model from the Raw Model InfModel infmodel = ModelFactory.createRDFSModel(myRawModel); // // // //
Use SPARQL CONSTRUCT to create a new Model using a reverse rule format i.e. IF drc likes someone AND that someone likes guitar THEN that someone is a musicfriend of drc String queryString = "PREFIX drc: " + "PREFIX rdf: " + "PREFIX foaf: " + "DESCRIBE ?x " + "WHERE {" + "{?x foaf:lastName \"Walken\" }" + " UNION {?x foaf:lastName \"walken\"} " + " }" + ""; // create a Jena CONSTRUCT query from the queryString com.hp.hpl.jena.query.Query query = QueryFactory.create(queryString); // create a Jena QueryExecution object that knows the query // and the N3 over which the query will be run QueryExecution qe = QueryExecutionFactory.create(query, infmodel); // executing the CONSTRUCT gives us a new mdoel with triples // that satisfy the WHERE clause Model newRawModel = qe.execDescribe(); // take a look at the new model newRawModel.write(System.out, "N3");
} }
------------ output -----------------run: @prefix @prefix @prefix @prefix @prefix @prefix @prefix @prefix
: dc: rdfs: foaf: dct: xsd: rdf: drc:
. . . . . . . .
_:b1
a drc:Song , drc:Art , drc:Product , drc:Video , rdfs:Resource ; drc:appelation "Weapon of Choice" ; drc:availableAt .
_:b2
a foaf:Person , foaf:person , rdfs:Resource ; drc:IsMarriedTo _:b3 ; foaf:firstName "Georgianne" ; foaf:knows _:b3 ; foaf:lastName "Walken" .
[]
a foaf:Person , foaf:person , rdfs:Resource ; drc:coStar drc:NatalieWood ; foaf:firstName "Christopher" ; foaf:interest drc:acting ; foaf:knows drc:NatalieWood ; foaf:lastName "Walken" ; foaf:nick "Chris" .
_:b4 a foaf:Person , drc:JobTitle , foaf:person , rdfs:Resource , drc:Artist , drc:Occupation , drc:Actor ; drc:actedIn drc:TheDeparted , drc:CatchMeIfYouCan , drc:ShutterIsland , drc:TheAviator ; drc:actedWith _:b5 ; drc:numOscarsNominated 3 ; drc:numOscarsWon 0 ; foaf:age "35" ; foaf:currentProject drc:LowDweller ; foaf:firstName "Leonardo" ; foaf:gender "male" ; foaf:img ; foaf:knows _:b5 ; foaf:lastName "DiCaprio" . [] a foaf:Person , drc:JobTitle , foaf:person , rdfs:Resource , drc:Artist , drc:Occupation , drc:Actor ; drc:appearedIn _:b1 ; drc:hasChildren "false"^^xsd:boolean ; drc:produces _:b1 ; foaf:familyName "Walken" ; foaf:firstName "Christopher" , "Chris" ; foaf:gender "male" ; foaf:givenName "Christopher" , "Chris" ; foaf:lastName "Walken" ; foaf:nick "Chris" ; foaf:surname "Walken" . _:b6
a foaf:Person , foaf:person , rdfs:Resource ; drc:marriedTo _:b7 ; foaf:firstName "Christopher" ;
foaf:knows _:b7 ; foaf:lastName "Walken" ; foaf:nick "Chris" . _:b5 a foaf:Person , drc:JobTitle , foaf:person , rdfs:Resource , drc:Artist , drc:Occupation , drc:Actor ; drc:actedIn drc:CatchMeIfYouCan , drc:TheDeerHunter ; drc:actedWith _:b4 ; drc:numOscarsNominated 2 ; drc:numOscarsWon 1 ; drc:oscarNominee drc:CatchMeIfYouCan ; drc:oscarWinner drc:TheDeerHunter ; foaf:age "67" ; foaf:currentProject drc:GirlAndAGun ; foaf:firstName "Christopher" ; foaf:gender "male" ; foaf:img ; foaf:interest drc:Elvis ; foaf:knows _:b4 ; foaf:lastName "Walken" ; foaf:nick "Chris" . _:b7
a foaf:Person , foaf:person , rdfs:Resource ; drc:marriedTo _:b6 ; foaf:age 71 ; foaf:based_near "New York, NY" ; foaf:birthday "1939" ; foaf:firstName "Georgianne" ; foaf:gender "female" ; foaf:givenName "Thon" ; foaf:image ; foaf:interest "acting" ; foaf:knows _:b6 ; foaf:lastName "Walken" ; foaf:title "Mrs" .
_:b3
a foaf:Person , foaf:person , rdfs:Resource ; drc:ActedIn drc:TheAndersonTapes , drc:CatchMeIfYouCan , drc:SaturdayNightLive ; drc:IsMarriedTo _:b2 ; drc:NumberOfAcademyAwards 1 ; foaf:firstName "Christopher" ; foaf:knows _:b2 , _:b8 ; foaf:lastName "Walken" ; foaf:nick "Chris" .
_:b9
a foaf:Person , foaf:person , rdfs:Resource ; drc:marriedTo _:b10 ; foaf:firstName "Georgianne" ; foaf:gender "female" ; foaf:knows _:b10 ; foaf:lastName "Walken" .
_:b8
a foaf:Person , foaf:person , rdfs:Resource ; drc:ActedIn drc:TheAndersonTapes , drc:YouOnlyLiveTwice , drc:NeverSayNeverAgain
; drc:IsMarriedTo [ a foaf:Person , foaf:person , rdfs:Resource ; drc:IsMarriedTo _:b8 ; foaf:firstName "Micheline" ; foaf:knows _:b8 ; foaf:lastName "Roquebrune"
] ; drc:NumberOfAcademyAwards 1 ; foaf:age 79 ; foaf:currentProject drc:SirBilli ; foaf:firstName "Sean" ; foaf:gender drc:Male ; foaf:homepage ; foaf:img ; foaf:interest drc:Golf , drc:Producing , drc:Acting ; foaf:knows _:b3 ; foaf:lastName "Connery" ; foaf:member drc:ScottishNationalParty ; foaf:pastProject drc:JamesBond , drc:TheRock ; foaf:status "Awesome" ; foaf:title "Sir" . _:b10 a foaf:Person , foaf:person , rdfs:Resource ; drc:currentOccupation drc:Actor ; drc:marriedTo _:b9 ; foaf:firstName "Christopher" , "Chris" ; foaf:gender "male" ; foaf:givenName "Ronald" ; foaf:knows _:b9 ; foaf:lastName "Walken" ; foaf:nick "Chris" ; foaf:pastProject . _:b11 a foaf:Person , foaf:person , rdfs:Resource ; foaf:firstName "Michael" ; foaf:lastName "Keaton" ; foaf:previousProject drc:BatmanReturns , drc:Batman . _:b12 a foaf:Person , foaf:person , rdfs:Resource ; foaf:firstName "Christopher" ; foaf:knows _:b13 ; foaf:lastName "Walken" ; foaf:nick "Chris" . _:b14 a foaf:Person , foaf:person , rdfs:Resource ; foaf:age "47" ; foaf:currentProject ; foaf:familyName "Meyers" ; foaf:firstName "Michael" , "Mike" ; foaf:gender "male" ; foaf:img ; foaf:interest ; foaf:knows _:b15 ; foaf:lastName "Meyers" ; foaf:pastProject . _:b15 a foaf:Person , foaf:person , rdfs:Resource ;
, , ; foaf:age "67" ; foaf:currentProject ; foaf:firstName "Christopher" ; foaf:gender "male" ; foaf:img ; foaf:knows _:b14 ; foaf:lastName "Walken" ; foaf:nick "Chris" . _:b16 a foaf:Person , foaf:person , rdfs:Resource ; foaf:firstName "Christopher" ; foaf:knows _:b17 ; foaf:lastName "Walken" ; foaf:nick "Chris" ; foaf:previousProject drc:TheIrishman . _:b17 a foaf:Person , foaf:person , rdfs:Resource ; foaf:birthday "1959-12-31"^^xsd:date ; foaf:currentProject drc:Riddle ; foaf:faimlyName "Kilmer" ; foaf:firstName "Val" ; foaf:knows _:b11 , _:b16 ; foaf:lastName "Kilmer" ; foaf:previousProject drc:TheIrishman ; foaf:topic_interest drc:LedZepplin . _:b13 a foaf:Person , foaf:person , rdfs:Resource ; foaf:age "45" ; foaf:birthday "07-22" ; foaf:familyName "Spade" ; foaf:firstName "David" ; foaf:gender "male" ; foaf:homepage ; foaf:img ; foaf:interest "tv" , "charity" , "movies" ; foaf:knows _:b12 ; foaf:schoolHomepage "http://www.asu.edu/" ; foaf:title "Mr" . BUILD SUCCESSFUL (total time: 2 seconds)
ASK package jenasemweb;
import import import import import import import import import import import import import import
com.hp.hpl.jena.query.QueryExecution; com.hp.hpl.jena.query.QueryExecutionFactory; com.hp.hpl.jena.query.QueryFactory; com.hp.hpl.jena.query.QuerySolution; com.hp.hpl.jena.query.ResultSet; com.hp.hpl.jena.rdf.model.InfModel; com.hp.hpl.jena.rdf.model.Model; com.hp.hpl.jena.rdf.model.ModelFactory; com.hp.hpl.jena.rdf.model.Property; com.hp.hpl.jena.rdf.model.Resource; com.hp.hpl.jena.rdf.model.Statement; com.hp.hpl.jena.rdf.model.StmtIterator; com.hp.hpl.jena.util.FileManager; com.hp.hpl.jena.util.PrintUtil;
/** * * @author Frank Coyle * This program illustrates how one can use the SPARQL CONSTRUCT feature * as a rule system to create new triples. The new triples become a new model * that we add to our existing model which lets us execute queries that we * would not be able to execute without the new triple. */ public class SparqlAsk01 { public static void main(String [] args) { // LOAD Raw Model from URL Model myRawModel = FileManager.get().loadModel( "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/Houghland.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/cruz.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/abraham.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/akundi.v2.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/bennett.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/hanna.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/liew_hw2.n3", "N3");
// READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/ramani.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/rawal.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/sison.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/tara.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/turney.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/onto/a3/wilson.n3", "N3"); // Create an RDFS inference model from the Raw Model InfModel infmodel = ModelFactory.createRDFSModel(myRawModel); // // // //
Use SPARQL CONSTRUCT to create a new Model using a reverse rule format i.e. IF drc likes someone AND that someone likes guitar THEN that someone is a musicfriend of drc String queryString = "PREFIX drc: " + "PREFIX rdf: " + "PREFIX foaf: " + "ASK {" + "{?x foaf:lastName \"Walken\" }" + " UNION {?x foaf:lastName \"walken\"} " + " }" + ""; // create a Jena CONSTRUCT query from the queryString com.hp.hpl.jena.query.Query query = QueryFactory.create(queryString); // create a Jena QueryExecution object that knows the query // and the N3 over which the query will be run QueryExecution qe = QueryExecutionFactory.create(query, infmodel); // executing the CONSTRUCT gives us a new mdoel with triples // that satisfy the WHERE clause boolean isFound = qe.execAsk(); System.out.println("ASK result is " + isFound);
} } --------- output -------ASK result is true
CONSTRUCT package jenasemweb;
import import import import import import import import import import import import import import
com.hp.hpl.jena.query.QueryExecution; com.hp.hpl.jena.query.QueryExecutionFactory; com.hp.hpl.jena.query.QueryFactory; com.hp.hpl.jena.query.QuerySolution; com.hp.hpl.jena.query.ResultSet; com.hp.hpl.jena.rdf.model.InfModel; com.hp.hpl.jena.rdf.model.Model; com.hp.hpl.jena.rdf.model.ModelFactory; com.hp.hpl.jena.rdf.model.Property; com.hp.hpl.jena.rdf.model.Resource; com.hp.hpl.jena.rdf.model.Statement; com.hp.hpl.jena.rdf.model.StmtIterator; com.hp.hpl.jena.util.FileManager; com.hp.hpl.jena.util.PrintUtil;
/** * * @author Frank Coyle * This program illustrates how one can use the SPARQL CONSTRUCT feature * as a rule system to create new triples. The new triples become a new model * that we add to our existing model which lets us execute queries that we * would not be able to execute without the new triple. */ public class SparqlConstruct01 { public static void main(String [] args) { // LOAD Raw Model from URL Model myRawModel = FileManager.get().loadModel( "http://lyle.smu.edu/~coyle/cse7392.semweb/code/rollo.n3", "N3"); // READ another N3 into the Model FileManager.get().readModel(myRawModel, "http://lyle.smu.edu/~coyle/cse7392.semweb/code/marla.n3", "N3"); // Create an RDFS inference model from the Raw Model InfModel infmodel = ModelFactory.createRDFSModel(myRawModel); // // // //
Use SPARQL CONSTRUCT to create a new Model using a reverse rule format i.e. IF drc likes someone AND that someone likes guitar THEN that someone is a musicfriend of drc String queryString = "PREFIX drc: " + "PREFIX rdf: " + "CONSTRUCT { drc:drc drc:musicfriend ?y }" + "WHERE {" + " drc:drc drc:likes ?y ." + " ?y drc:likes drc:guitar ." + " }"; // create a Jena CONSTRUCT query from the queryString com.hp.hpl.jena.query.Query query = QueryFactory.create(queryString);
// create a Jena QueryExecution object that knows the query // and the N3 over which the query will be run QueryExecution qe = QueryExecutionFactory.create(query, infmodel); // executing the CONSTRUCT gives us a new mdoel with triples // that satisfy the WHERE clause Model newRawModel = qe.execConstruct(); // take a look at the new model newRawModel.write(System.out, "N3"); // NOW, add the statements generated by the CONSTRUCT // to the original model - expanding it with new statements infmodel.add(newRawModel); // look at the new expanded model infmodel.write(System.out, "N3"); // Create a new SPARQL query queryString = "PREFIX drc: " + "PREFIX rdf: " + "SELECT ?y " + // gotcha: MUST be a space after last ?var "WHERE {" + " drc:drc drc:musicfriend ?y ." + " }"; // create a Jena query from the queryString query = QueryFactory.create(queryString); // create a Jena QueryExecution object that knows the query // and the N3 over which the query will be run qe = QueryExecutionFactory.create(query, infmodel);
// execute the query - get back a ResultSet ResultSet results = qe.execSelect(); // iterate over the result set while(results.hasNext()) { QuerySolution sol = results.next(); System.out.println("Solution:" + sol.toString() ); }
} }
