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Practical RDF Shelley Powers
Publisher: O'Reilly Media

MTMH 2012 was a joint hackathon between the people working on p5-mop (a project to get a Moose-lite metaobject system into the Perl 5 core) and the Perl RDF toolkit, with a few Rakudo people thrown in too, ostensibly for convergence between the p5-mop and Perl 6 metaobject systems when possible. Topic Maps have the same advantage over XML, but then goes on to add some that RDF does not share: You know the name of every object. Every time I write about graphs, I am stuck with the same dilema. Yes, I did not mention RDF/LinkedData/etc. If practical, we should be looking at backporting features from Perl 6 to Perl 5, not just because it has an awesome feature set, but to help ease transition. In fact, I often advise people to search for Linked Data rather than Semantic Web as the usefulness of the results in a practical context is vast. Do I or do I not talk about the Semantic Web. Six-time Filipino world speed shooting champion Jethro Dionisio is back to his favorite .38 caliber pistol and is eager to get back his status as the top gun in the practical shooting scene. But what if you're a lot more interested in Web 2.0, which is practical and real, than in the Semantic Web, about which opinions vary widely? A couple of years ago, I started reading Shelley Powers' book, “Practical RDF” [1]. Practical P-P-P-Problems with Linked Data The first LOD cloud diagram was published three years ago (upper left figure below), with 25 datasets consisting of over two billion RDF triples and two million RDF links. Leigh Dodds presents the first of a multipart tutorial on SPARQL, a query language for RDF and the Semantic Web, which may also play a role in Web 2.0 apps and services. So, while we wait for the semantic web to evolve, what is RDF good for today? In short, for authored documents, an XML markup with audience-sensitive implication is much more practical. And the availability of several SPARQL query engines means that this exploration can be practical rather than theoretical. In the context of RDF's semantic model, the TRUTH of a triple has a very limited, formal meaning.