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 the bound(…) filter function can be used to mimic some universally quantified queries. As an example, consider […]
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 talking about some problem domain instead of the language. I think that’s the goal […]
Magnus is blogging today’s Web 2.0 info session from here onward (in German). A bunch of photos: Set 1, Set 2.
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 bits of content in the XML messages map to an equivalent RDF description of […]
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 for the audience of XML and Web folks here. Is the Semantic Web AI on the […]
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 talk is about formalizing the domain of NP-complete problems. The ontology has classes like “Decision Problem”, “Complexity […]
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 is a Z ifff …” These can be extracted with text analysis. The goal is an ontology […]
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 and down the Semantic Web technology stack, it gets more interesting later on. Typical Semantic Web applications […]