-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Roller Team,
As you might already know I'm involved with W3C working group for SPARQL [1]. I met there Henry Story from Sun who is working on an OWL Ontology for Atom [2]. He is very interested in seeing his work made an specification, but before we support him on that endeavor I would like to test it first. An idea we had with Dan Connolly was to add a SPARQL endpoint to Roller and use Henry's ontology to model queries against the Roller database. Here's an example query: (return title and summary for all entries written by John Doe). PREFIX atom: <http://www.w3.org/2005/10/23/Atom#> SELECT ?title ?summary WHERE { ?feed atom:entry ?entry ; atom:author [ atom:name "John Doe" ]. ?entry atom:title [ atom:value ?title ] ; atom:summary [ atom:value ?summary ] . } LIMIT 20 For data that looks like this: [] a :Feed, :Version; :title [ :value "Example Feed"; :type "text/plain" ]; :link [ :href <http://example.org/>; :rel iana:alternate ]; :updated "2003-12-13T18:30:02Z"^^xsd:dateTime; :author [ :name "John Doe" ]; :id <urn:uuid:60a76c80-d399-11d9-b93C-0003939e0af6>; :entry [ a :Entry, :Version; :title [ :value "Atom-Powered Robots Run Amok"; :type "text/plain" ]; :link [ :href <http://example.org/2003/12/13/atom03.html>; :rel iana:alternate ]; :id <urn:uuid:1225c695-cfb8-4ebb-aaaa-80da344efa6a>; :updated "2003-12-13T18:30:02Z"^^xsd:dateTime; :summary [ :value "some text"; :type "text/plain" ] ] . More examples [6] SPARQL defines a protocol [3] that allows GET requests to be submitted with queries. And it just gets better, I have spec'd out a JSON output for the SPARQL results [4]. This means that we could have a very open way to query the Roller database and output JSON for Web 2.0 applications. I can do all of this without making a single change to the Roller code or database, except for adding a servlet and a few jars (jena) [5]. Jena is BSD license (is that ok for Apache projects). It would be very interesting to test both the Atom+OWL and the SPARQL query language on a very popular dataset (JRoller, blogs.sun, etc). I can do this in the sandbox at first, but unless the /roller/sparql is being hit, it should not be a big deal to the Roller codebase. However, I wanted to get a feel for your thoughts on this one. - -Elias [1] http://www.w3.org/2001/sw/DataAccess/ [2] http://pragmatron.org/trac/file/pragmatron/atom-owl/AtomOwl.n3 [3] http://www.w3.org/2001/sw/DataAccess/proto-wd/ [4] http://www.mindswap.org/~kendall/sparql-results-json/ [5] http://jena.sourceforge.net/ [6] http://www.intertwingly.net/wiki/pie/PaceSparqlLink -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFEGKjHtsNTCOFcV0oRAsJ4AJ9EfLgq2O9gVW1S4l6g/un8W9YgjACeMMBi 1iGZfk7+3Wz6kUmmzE/vC9A= =PVXi -----END PGP SIGNATURE-----
