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Hi, I know there are some gems related to RDF processing like RDF.rb (~1 yr ago) and ActiveRDF (~ 6months ago). But it seems this gems are not really under active development anymore!? What gem does a good job in creating RDF/RDFS/OWL graphs and querying them with SPARQL/DL? Are there other useful gems I should follow and use in my ruby on rails application? Is there still an active ruby community behind semantic web stuff? If yes, where can I found it? Thanks |
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Hello, Yes, the development of the RDF.rb ecosystem is still being actively developed, primarily by Gregg Kellogg. Recent developments include the best RDFa 1.1 parser implementation and a JSON-LD gem. The most up to date GitHub repos are now here: https://github.com/ruby-rdf/ There is a SPARQL 1.0 implementation here: http://rubygems.org/gems/sparql Although I would recommend using an external SPARQL engine (eg 4store / BigOWLIM) and then query using the SPARQL client gem. There is a (slightly quiet) community mailing list of RDF and Ruby here: http://lists.w3.org/Archives/Public/public-rdf-ruby/ nick. |
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I've been developing alternative Ruby bindings to librdf, named Redlander: https://github.com/cordawyn/redlander . I feel they're production-ready, but I'd love to get some feedback, to be sure. And there's even higher-level gem built around Redlander, Kalimba, which provides ActiveRecord-like API and feel, aiming to be a drop-in replacement for AR itself: http://github.com/cordawyn/kalimba . I stopped contributing to Spira and RDF.rb (rdf-sesame, in particular) due to unacceptable performance of those gems for my projects, but if you're into "academic completeness" (as opposed to "industrial performance") you may prefer those. You may also take a look at the tools that go with Samizdat ( http://samizdat.nongnu.org/ ): they underwent pretty good updates lately. |
"OWL graph" is a nonsense. Yes, OWL does have an RDF-based semantics which allows us to represent an OWL ontology as an RDF graph, but there is no such thing as "OWL graph".
Yes, OWL describes ontologies, but this ontologies are based on RDF graphs, ergo it is a graph, isn't it?