SPARQLing Roller

Would you like to have a standard and extensible query language for querying any blog servers? Well I have recently been working on implementing just this. Using the D2RQ library developed at the Freie Universit├Ąt of Berlin and the Roller Weblogger software that is powering blogs.sun.com, I have put up a test server that maps Roller's mysql tables to the AtomOwl ontology.

For an overview of how this works consult the Open Document Format Slide Show Sparqling Roller (pdf) .

You can also play with the test Roller server (but don't put any valuable data on there as it is unstable):
  • The Roller Test Server Root, where you can create an account for yourself and start your own blog.
  • The The Silver Blog, is the example blog mentioned in the presentation.
  • The The D2RQ mapping server, where you can find the SPARQL end point to query everything available on the blog server, or simply browse the mapped mysql database using a plain html browser.

If you are interested in doing something similar to your own blog server, or you would like to write a client (AJAX, or other) to use this, please subscribe to the AtomOwl mailing list. This is still experimental, and we need feedback make it better.

For more on AtomOwl see the development web site at https://sommer.dev.java.net/atom/, where you can pick up XSLTs and XQuery scripts to transform atom xml into AtomOwl, among other things.

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Comments:

Cool, just a minor question: What is the SPARQL endpoint URL?

Posted by Max Völkel on October 16, 2006 at 01:49 PM CEST #

Max: The endpoint is at http://roller.blogdns.net:2020/sparql

Posted by Richard Cyganiak on October 16, 2006 at 02:55 PM CEST #

And just as a reminder the user friendly SPARQL demo page, called snorql, is located at http://roller.blogdns.net:2020/snorql/. Use that one to play around with SPARQL queries.

Posted by Henry Story on February 20, 2007 at 03:43 PM CET #

The demo endpoint is down now. I'll see if I can get it incorporated into Roller at some point. Or if other would like to help please feel free. The PDF and other files are still available.

Posted by Henry Story on May 28, 2007 at 06:29 PM CEST #

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