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| author | Chris Cannam |
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| date | Fri, 13 Oct 2017 09:23:49 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/jamendo/jamendo.html Fri Oct 13 09:23:49 2017 +0100 @@ -0,0 +1,212 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> + +<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> + +<head> +<title>DBTune - Jamendo RDF dump</title> + +<style type="text/css" media="all"> + @import url(style.css); +</style> + +</head> + +<body> + + +<a href="http://dbtune.org/"><h1 style="font-size: 250%;">DBTune.org</h1></a> + +<div id="tagline">Jamendo RDF server</div> + +<h2><a name="intro" id="intro"></a>1. Introduction</h2> + +<p> + +<a href="http://jamendo.com/">Jamendo</a> is a large repository of Creative Commons licensed music, based in France. +This server aims at publishing this dataset +as <a href="http://linkeddata.org">Linked Data</a>: publishing a set of URIs +with an <a href="http://www.w3.org/RDF/">RDF</a> representation holding +links towards external datasets (so far, <a href="http://geonames.org/">Geonames</a> and <a href="http://musicbrainz.org/">Musicbrainz</a>). +The corresponding RDF is also linked to <a href="http://musicontology.com/">Music Ontology</a> terms. +</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="browse" id="browse"></a>2. Browsing the dataset</h2> +<p> +All resource identifiers defined by this RDF dump are dereferencable. <!--, and support content negotiation. +Using the <i>Accept: application/rdf+xml</i> header field, a RDF/XML representation of the resource is sent back. +Otherwise, a HTML representation, done using <a href="http://www.w3.org/2005/ajar/tab">the Tabulator Data browser</a>, +is sent back.--> +</p> +<p> +Here are some entry points to the dataset: +</p> + +<ul> + +<li><a href="http://dbtune.org/jamendo/artist/1005">Vincent J.</a> (artist), +in <a href="http://demo.openlinksw.com/rdfbrowser2/?uri=http://dbtune.org/jamendo/artist/1005">OpenLink data explorer</a>, +<a href="http://dataviewer.zitgist.com/?uri=http://dbtune.org/jamendo/artist/1005">Zitgist data viewer</a>, +<a href="http://beckr.org/marbles?uri=http://dbtune.org/jamendo/artist/1005">Marbles</a>, +<a href="http://www4.wiwiss.fu-berlin.de/rdf_browser/?browse_uri=http://dbtune.org/jamendo/artist/1005">DISCO</a>, +<a href="http://dig.csail.mit.edu/2005/ajar/release/tabulator/0.8/tab.html?uri=http://dbtune.org/jamendo/artist/1005">Tabulator</a> +</li> +<li><a href="http://dbtune.org/jamendo/artist/1023">Carter Hotel</a> (artist) +in <a href="http://demo.openlinksw.com/rdfbrowser2/?uri=http://dbtune.org/jamendo/artist/1023">OpenLink data explorer</a>, +<a href="http://dataviewer.zitgist.com/?uri=http://dbtune.org/jamendo/artist/1023">Zitgist data viewer</a>, +<a href="http://beckr.org/marbles?uri=http://dbtune.org/jamendo/artist/1023">Marbles</a>, +<a href="http://www4.wiwiss.fu-berlin.de/rdf_browser/?browse_uri=http://dbtune.org/jamendo/artist/1023">DISCO</a>, +<a href="http://dig.csail.mit.edu/2005/ajar/release/tabulator/0.8/tab.html?uri=http://dbtune.org/jamendo/artist/1023">Tabulator</a> +</li> +<li><a href="http://dbtune.org/jamendo/record/2931">First Dub</a> (album) +in <a href="http://demo.openlinksw.com/rdfbrowser2/?uri=http://dbtune.org/jamendo/record/2931">OpenLink data explorer</a>, +<a href="http://dataviewer.zitgist.com/?uri=http://dbtune.org/jamendo/record/2931">Zitgist data viewer</a>, +<a href="http://beckr.org/marbles?uri=http://dbtune.org/jamendo/record/2931">Marbles</a>, +<a href="http://www4.wiwiss.fu-berlin.de/rdf_browser/?browse_uri=http://dbtune.org/jamendo/record/2931">DISCO</a>, +<a href="http://dig.csail.mit.edu/2005/ajar/release/tabulator/0.8/tab.html?uri=http://dbtune.org/jamendo/record/2931">Tabulator</a> +</li> +</ul> + +<p> +The service also exposes some informational RDF documents. +Such documents are: +</p> + +<ul> + +<li><a href="http://dbtune.org/jamendo/all/artist">All artists</a></li> +<li><a href="http://dbtune.org/jamendo/all/track">All tracks</a></li> +<li><a href="http://dbtune.org/jamendo/all/record">All records</a></li> +<li><a href="http://dbtune.org/jamendo/all/performance">All performances</a></li> +<li><a href="http://dbtune.org/jamendo/all/signal">All signals</a></li> +<li><a href="http://dbtune.org/jamendo/all/timeline">All timelines</a></li> + +</ul> + +<!--<p> +To test them using a Semantic Web browser, load one of them into the Tabulator (eg. +<a href="http://dbtune.org/jamendo/all/artist">http://dbtune.org/jamendo/all/artist</a>) +and then look for <a href="http://purl.org/ontology/mo/MusicArtist">http://purl.org/ontology/mo/MusicArtist</a>. You will then see +the list of all Jamendo MusicArtist instances. +</p>--> + +<h2><a name="query" id="query"></a>3. Links</h2> +<p> +This dataset is interlinked with the <a href="http://geonames.org/">Geonames</a> +and the <a href="http://musicbrainz.org/">Musicbrainz</a> datasets. +</p> +<p> +For an example of a resource which description holds one <i>owl:sameAs</i> link to +a Musicbrainz resource, and one <i>foaf:based_near</i> link to a Geonames resource, try +<a href="http://dbtune.org/jamendo/artist/5">this one (a French band called <i>Both</i>)</a>. +The <a href="http://dig.csail.mit.edu/2005/ajar/ajaw/tab?uri=http://dbtune.org/jamendo/artist/5">same resource, +displayed in the Tabulator</a>. +</p> + +<h2><a name="query" id="query"></a>4. Querying the dataset</h2> +<p> +The service also exposes a <a href="http://www.w3.org/TR/rdf-sparql-query/">SPARQL</a> end-point, available +at <a href="http://dbtune.org/jamendo/sparql/">http://dbtune.org/jamendo/sparql/</a>. There is also a small +web interface available at <a href="http://dbtune.org/jamendo/store/">http://dbtune.org/jamendo/store/</a>. +</p> + +<p> +For example, the end-point can answer the following query: +<pre> +PREFIX geo: <http://www.geonames.org/ontology#> +PREFIX wgs: <http://www.w3.org/2003/01/geo/wgs84_pos#> +SELECT DISTINCT ?an ?lat ?long ?name ?population +WHERE +{ ?a + a mo:MusicArtist; + foaf:based_near ?place; + foaf:name ?an; + foaf:made ?alb. + ?alb tags:taggedWithTag <http://dbtune.org/jamendo/tag/punk>. + ?place + geo:name ?name; + geo:population ?population; + wgs:lat ?lat; + wgs:long ?long } +ORDER BY ?population +</pre> +This selects artists within Jamendo who made at least one album +tagged as `punk' by a Jamendo user, sorted by the number of inhabitants of the places they are based near. +</p> + + + +<h2><a name="dump" id="dump"></a>5. RDF dump</h2> +<p> +The RDF dump is <a href="http://moustaki.org/resources/jamendo-rdf.tar.gz">available for download</a>. +The package holds the raw Jamendo data converted to RDF (available under the same license than the raw Jamendo +data itself), as well as the links towards Geonames and the links towards Musicbrainz. These links are available +under a <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/">Creative Commons Attribution-Noncommercial-Share Alike 3.0 License</a> (subject to +change, ask me). +</p> + +<h2><a name="tools" id="tools"></a>6. Tools</h2> +<p> +The code needed to make this service run takes less than 900 lines of code! This, I guess, demonstrates the +power of <a href="http://www.swi-prolog.org">SWI Prolog</a> and its <i>SeRQL</i>, <i>semweb</i> and <i>http</i> packages. +</p> +<p> +The code is split in two parts, and is available under a copyleft license - feel free to use it! +</p> +<p> +The first part is available <a href="http://moustaki.org/urispace/">here</a>. It is a small HTTP server implementing content +negotiation. The behavior of the server is specified by a declarative mapping from resource identifiers to the location of +their representation. +</p> + +<p> +The second part is available <a href="http://moustaki.org/p2r/">here</a>. It is an equivalent of +<a href="http://sites.wiwiss.fu-berlin.de/suhl/bizer/d2r-server/">D2R Server</a>, but for Prolog knowledge base. +It allows to translate dynamically RDF queries to Prolog queries - which may wrap XML parsing, +<!--(as it is done in +the Jamendo RDF dump), --> +calls to web services, databases, etc. +</p> +<p> +The behavior of this component is also specified through a declarative mapping (the package ships with some mapping +examples) between prolog predicates and a set of RDF predicates. +</p> + +<h2><a name="stats" id="stats"></a>7. Statistics</h2> + +<p> +<table border="1"> +<tr><td>Triple count</td><td>1.1 million triples +</td></tr> +<tr><td>Distinct <a href="http://geonames.org/">Geonames</a> resources</td> +<td>289</td></tr> +<tr><td>Distinct <a href="http://musicbrainz.org/">Musicbrainz</a> resources</td><td>119</td></tr> +</table> +</p> + +<!--<ul> +<li>Links to Musicbrainz - <a href="http://blog.dbtune.org/post/2007/06/11/Linking-open-data%3A-interlinking-the-Jamendo-and-the-Musicbrainz-datasets">DONE</a></li> + +</ul> --> + +<script type="text/javascript"> +var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); +document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); +</script> +<script type="text/javascript"> +var pageTracker = _gat._getTracker("UA-3327144-3"); +pageTracker._initData(); +pageTracker._trackPageview(); +</script> + + +</body> + +</html> +