ARQを使ってSPARQLをやってみた2(FROMとFROM NAMEDの結合)

これ('RDF用クエリ言語SPARQL/8.2.3 FROMとFROM NAMEDの結合')をやってみた．

やってみた

０．環境
前回環境を参考

１．データファイル
data_8.2.1_1.ttl

# Default graph (stored at http://example.org/dft.ttl)
@prefix dc: <http://purl.org/dc/elements/1.1/> .

<http://example.org/bob>    dc:publisher  "Bob Hacker" .
<http://example.org/alice>  dc:publisher  "Alice Hacker" .

data_8.2.1_2.ttl

# Named graph: http://example.org/bob
@prefix foaf: <http://xmlns.com/foaf/0.1/> .

_:a foaf:name "Bob" .
_:a foaf:mbox <mailto:bob@oldcorp.example.org> .

data_8.2.1_3.ttl

# Named graph: http://example.org/alice
@prefix foaf: <http://xmlns.com/foaf/0.1/> .

_:a foaf:name "Alice" .
_:a foaf:mbox <mailto:alice@work.example.org> .

各ファイルの'#'行はコメントなのでこれでナニカを定義しているわけではない．

２．コード
Test_8_2_3.java

package sample;

import org.openjena.atlas.lib.StrUtils;

import com.hp.hpl.jena.query.DataSource;
import com.hp.hpl.jena.query.DatasetFactory;
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.ResultSetFormatter;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.util.FileManager;

public class Test_8_2_3 {
 public static void main(String[] args) {
  Model model1 = ModelFactory.createDefaultModel();
  FileManager.get().readModel(model1, "data_8.2.3_1.ttl");
  Model model2 = ModelFactory.createDefaultModel();
  FileManager.get().readModel(model2, "data_8.2.3_2.ttl");
  Model model3 = ModelFactory.createDefaultModel();
  FileManager.get().readModel(model3, "data_8.2.3_3.ttl");
  
  DataSource dataSource= DatasetFactory.create();
  dataSource.setDefaultModel(model1);
  dataSource.addNamedModel("http://example.org/bob", model2);
  dataSource.addNamedModel("http://example.org/alice", model3);
  System.out.println(dataSource.asDatasetGraph().toString());
  System.out.println();
  
  String queryString = StrUtils.strjoin("\n",
    "PREFIX foaf: <http://xmlns.com/foaf/0.1/>",
    "PREFIX dc: <http://purl.org/dc/elements/1.1/>",
    "",
    "SELECT ?who ?g ?mbox",
    "FROM <http://example.org/dft.ttl>",
    "FROM NAMED <http://example.org/alice>",
    "FROM NAMED <http://example.org/bob>",
    "WHERE",
    "{",
    "   ?g dc:publisher ?who .",
    "   GRAPH ?g { ?x foaf:mbox ?mbox }",
    "}");
  Query query = QueryFactory.create(queryString);

  QueryExecution qExec = QueryExecutionFactory.create(query, dataSource);
  ResultSetFormatter.out(System.out, qExec.execSelect(), query);
  qExec.close();
 }
}

（'addNamedModelの第一引数の値で関連づけている）

３．実行

(dataset
  (graph
    (triple <http://example.org/alice> <http://purl.org/dc/elements/1.1/publisher> "Alice Hacker")
    (triple <http://example.org/bob> <http://purl.org/dc/elements/1.1/publisher> "Bob Hacker")
  )
  (graph <http://example.org/bob>
    (triple _:-335a33de:130a7151814:-7fff <http://xmlns.com/foaf/0.1/mbox> <mailto:bob@oldcorp.example.org>)
    (triple _:-335a33de:130a7151814:-7fff <http://xmlns.com/foaf/0.1/name> "Bob")
  )
  (graph <http://example.org/alice>
    (triple _:-335a33de:130a7151814:-7ffe <http://xmlns.com/foaf/0.1/mbox> <mailto:alice@work.example.org>)
    (triple _:-335a33de:130a7151814:-7ffe <http://xmlns.com/foaf/0.1/name> "Alice")
  ))


----------------------------------------------------------------------------------
| who            | g                          | mbox                             |
==================================================================================
| "Alice Hacker" | <http://example.org/alice> | <mailto:alice@work.example.org>  |
| "Bob Hacker"   | <http://example.org/bob>   | <mailto:bob@oldcorp.example.org> |
----------------------------------------------------------------------------------