Monthly Archives: September 2006

MIN/MAX in SPARQL

Posted on September 29, 2006 by Richard Cyganiak

Reading through Lee’s new SPARQL FAQ I didn’t really expect to learn anything new, but here we go: How can I use SPARQL to query maximum/minimum values or other universally quantified criteria? A combination of the SPARQL OPTIONAL keyword and … Continue reading →

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Invisible language

Posted on September 27, 2006 by Richard Cyganiak

Steve Yegge: I have a lot of trouble writing about Ruby, because I find there’s nothing to say. […] Ruby seems so self-explanatory to me. It makes it almost boring; you try to focus on Ruby and you wind up … Continue reading →

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[bxmlt] Photos and Web 2.0 Infotag

Posted on September 27, 2006 by Richard Cyganiak

Magnus is blogging today’s Web 2.0 info session from here onward (in German). A bunch of photos: Set 1, Set 2.

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[bxmlt] Eric Prud’hommeaux – SAWSDL

Posted on September 27, 2006 by Richard Cyganiak

Eric shows off SAWSDL. I didn’t know about it before. It defines mappings from Web Services to RDF. The basic idea is to start with a WSDL description of the web service. Then add a few attributes that describe how … Continue reading →

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[bxmlt] Ivan Herman – Questions (and Answers) on the Semantic Web

Posted on September 27, 2006 by Richard Cyganiak

Ivan is here today for the W3C Tag and gives a keynote to the general conference audience (Slides). If you read this through Planet RDF you won’t find much new in this talk, but I think it is very appropriate … Continue reading →

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[bxmlt] Uwe Krüger – NPBibSearch, an ontology of NP-complete problems

Posted on September 26, 2006 by Richard Cyganiak

From the problem of the NP-completeness of ontologies, we now move to an ontology of NP-complete problems. The famous “P = NP?” is one of the big unsolved questions of computer science, with a large body of existing work. The … Continue reading →

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[bxmlt] Nicole Natho – mArachna, an OWL-based mathematical knowledge base

Posted on September 26, 2006 by Richard Cyganiak

In this short talk, Nicole describes a system that extracts knowledge from mathematical texts in order to build an intelligent encyclopedia. In mathematical texts, there are sections with a fairly regular structure: conditions, conclusions, properties. “Let x be … Y … Continue reading →

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[bxmlt] Heiner Stuckenschmidt – What’s Wrong with the Semantic Web?

Posted on September 26, 2006 by Richard Cyganiak

I’m at Berliner XML Tage, an annual German-language XML and Semantic Web conference in Berlin. The keynote by Heiner Stuckenschmidt of Universität Mannheim features a provocative title. After a recap of the 2001 SciAm paper and a short journey up … Continue reading →

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