"http://dbpedia.org/sparql",
);
/* Create the 'remote store' */
$dbpedia = ARC2::getRemoteStore($dbpconfig);
/* Configure the app to use DBTune. */
$dbtconfig = array(
"remote_store_endpoint" => "http://dbtune.org/musicbrainz/sparql",
);
/* Create the 'remote store' */
$dbtune = ARC2::getRemoteStore($dbtconfig);
/* Let's start with some genre (Art rock). */
$genre = "Art_rock";
if ($_GET['genre']) {
$genre = urlencode($_GET['genre']);
}
$uri = "http://dbpedia.org/resource/$genre";
$offset = 0;
if ($_GET['offset']) {
$offset = intval($_GET['offset']);
}
/* Here we grab artists. */
$q = "
PREFIX dbpedia-owl-artist:
PREFIX rdfs:
PREFIX dbpprop:
SELECT DISTINCT ?artist ?artisturi ?yearsActive
WHERE
{ ?artisturi dbpedia-owl-artist:genre <$uri> ;
rdfs:label ?artist .
OPTIONAL { ?artisturi dbpprop:yearsActive ?yearsActive . }
FILTER ( langMatches(lang(?artist), \"EN\") ) }
ORDER BY ?artist
OFFSET $offset
LIMIT 25
";
$artists = $dbpedia->query($q, 'rows');
/* But we need to do some legwork to get the number of albums, since
we don't have a sameAs link back to DBTune. We use sameAs.org to go
backwards. */
$newArtists = array();
foreach ($artists as $key => $artist) {
$sameAsURI = "http://sameas.org/rdf?uri=" . urlencode($artist['artisturi']);
$parser = ARC2::getRDFXMLParser();
$parser->parse($sameAsURI);
$triples = $parser->getTriples();
$dbturi = '';
foreach ($triples as $triple) {
if (substr($triple['o'], 0, 46) == 'http://dbtune.org/musicbrainz/resource/artist/') {
$dbturi = $triple['o'];
break;
} elseif (substr($triple['o'], 0, 35) == 'http://www.bbc.co.uk/music/artists/') {
/* Some hacks around the fact that DBTune may not be present on
all artists. */
$dbturi = 'http://dbtune.org/musicbrainz/resource/artist/' . substr($triple['o'], 35, 36);
break;
} elseif (substr($triple['o'], 0, 33) == 'http://zitgist.com/music/artist/') {
/* Some hacks around the fact that DBTune may not be present on
all artists. */
$dbturi = 'http://dbtune.org/musicbrainz/resource/artist/' . substr($triple['o'], 33);
break;
}
}
$newArtists[$key] = $artist;
$newArtists[$key]['artisturi'] = $dbturi;
if ($dbturi != '') {
/* Now that we have the DBTune URI, we can query it for the number
of albums. */
$q = "
PREFIX foaf:
PREFIX mo:
SELECT ?album
WHERE
{ ?album a mo:Record ;
foaf:maker <$dbturi> . }";
$dbtArtist = $dbtune->query($q, 'rows');
$newArtists[$key]['albums'] = count($dbtArtist);
} else {
$newArtists[$key]['artisturi'] = '';
$newArtists[$key]['albums'] = '';
}
}
$artists = $newArtists;
$i = $offset % 2;
foreach ($artists as $artist) {
?>
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