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       <title>DBTune - Playcount data linking BBC /programmes and Musicbrainz</title>
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               @import url(style.css);
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       <a href="http://dbtune.org/"><h1 style="font-size: 250%;">DBTune.org</h1></a>
       <div id="tagline">Playcount data linking BBC /programmes and Musicbrainz</div>
       <h2><a name="intro" id="intro"></a>1. Introduction</h2>
       <p>
       The <a href="http://www.bbc.co.uk/">BBC</a> has <a href="http://mashed-audioandmusic.dyndns.org/">made available</a> a dataset of playcounts of artists
       per episode and brands in their <a href="http://www.bbc.co.uk/programmes">programmes catalogue</a>, for the <a href="http://mashed08.eventbrite.com/">Mashed 2008</a> event.
       </p>
       <p>
       This service provides RDF links using these playcounts, to link the
       <a href="http://dbtune.org/musicbrainz/">Musicbrainz linked data</a> and the
       <a href="http://bbc-programmes.dyndns.org/">BBC programmes linked data</a>.
       The earlier is designed with the <a href="http://purl.org/ontology/mo/">Music Ontology</a>, the latter is designed with the <a href="http://www.bbc.co.uk/ontologies/programmes/">BBC Programmes ontology</a>.
       </p>
       <p>
       This effort is part of the <a href="http://esw.w3.org/topic/SweoIG/TaskForces/CommunityProjects/LinkingOpenData">Linking
       Open Data on the Semantic Web</a> community project, hosted by the <a href="http://www.w3.org/2001/sw/sweo/">Semantic
       Web Education and Outreach</a> interest group.
       </p>
       <h2><a name="use" id="use"></a>2. Using this service</h2>
       <p>
       A playcount URI in this service looks like:
       <pre>
       http://dbtune.org/bbc/playcount/&lt;id&gt;_&lt;k&gt;
       </pre>
       Where &lt;id&gt; is the id of the episode or the brand, as in
       <a href="http://www.bbc.co.uk/programmes">/programmes BBC catalogue</a>,
       and &lt;k&gt; is a number between 0 and the number of playcounts
       for the episode or the brand.
       </p>
       <p>
       For example, the following URI corresponds to the playcount of
       <a href="http://dbtune.org/musicbrainz/resource/artist/070d193a-845c-479f-980e-bef15710653e">Prince</a> on
       the <a href="http://bbc-programmes.dyndns.org/programmes/b006wk6f#brand">Fabio and Grooverider DJ show</a>.
       <pre>
       http://dbtune.org/bbc/playcount/b006wk6f_1
       </pre>
       </p>
       <h2><a name="sparql" id="sparql"</a>3. Querying the dataset</a></h2>
       <p>
       We expose a <a href="http://dbtune.org/bbc/playcount/sparql/">SPARQL end-point</a>
       for querying this data, and also a <a href="http://dbtune.org/bbc/playcount/store/">web interface</a> for this end-point.
       The SPARQL end-point also holds aggregated information (around 2 million triples) from
       Musicbrainz and the BBC Programmes service.
       The end-point is available at:
       <pre>http://dbtune.org:3062/sparql</pre>
       </p>
       <p>
       An example query is the following one:
       <pre>
       SELECT ?brand ?title ?count
       WHERE {
          ?artist a mo:MusicArtist;
             foaf:name "The Beatles".
          ?pc pc:object ?artist;
              pc:count ?count.
          ?brand a po:Brand;
              pc:playcount ?pc;
              dc:title ?title
           FILTER (?count&gt;10)}
       </pre>
       This will return every BBC brands in which The Beatles were featured at least ten times.
       </p>
       <h2><a name="onto" id="onto"></a>4. Playcount ontology</h2>
       <p>
       For the purpose of representing playcounts, we designed a really
       small <a href="http://purl.org/ontology/playcount/">playcount ontology</a>.
       This ontology defines one playcount concept, and three properties
       to link it to the media in which we are counting something, the actual thing,
       and actual  playcount. This ontology can be used as in the following
       example:
       </p>
       <pre>
       :radioepisode pc:playcount [a pc:Playcount; pc:count 12; pc:object :track].
       </pre>
       <h2><a name="code" id="code"></a>5. Code</h2>
       <p>
       As usual, <a href="http://motools.svn.sourceforge.net/viewvc/motools/dbtune/playcount">all the code running this service</a>
       is open source and based
       on <a href="http://www.swi-prolog.org">SWI-Prolog</a>
       </p>
       <h2><a name="stats" id="stats"></a>6. Statistics</h2>
       <p>
       <table border="1">
       <tr><td>Triple count</td><td>1,954,786</td></tr>
       <tr><td>Distinct <a href="http://bbc-programmes.dyndns.org/">BBC Programmes</a>
       resources</td><td>6,863</td></tr>
       <tr><td>Distinct <a href="http://dbtune.org/musicbrainz/">Musicbrainz</a>
       resources</td><td>7,055</td></tr>
       </table>
       </p>
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