RDF.rb 0.3.4 released

After several months of gathering updates for RDF.rb, we’ve released version 0.3.4 with several new features:

• Update to BGP query model to support SPARQL semantics,
• Expandable Litereal support, to allow further implementation of XSD datatypes outside of RDF.rb (see RDF::XSD gem),
• More advanced content type detection to allow better selection of the appropriate reader from those available on the client. (Includes selecting among HTML types, such as Microdata and RDFa)
• Improved CLI with the rdf executable providing access to all loaded readers and writers for cross-language serialization and deserialization.</http:>

As an example of format detection, consider the following:

require 'linkeddata'
RDF::Graph.load("http://greggkellogg.net/foaf.ttl")

should load Turtle or N3 readers if installed. This becomes more important for ambiguous file types, such as HTML, which could be either RDFa or Microdata, and application/xml, which could be TriX, RDF/XML or even RDFa.

See documentation for more specifics on this version of RDF.rb. Note that I’ve attempted to incorporate suggestions for improving the documentation.

Most of the reader/writer gems have been updated to match this release, in particular JSON::LD, RDF::Microdata, RDF::N3, RDF::RDFa, RDF::RDFXML, and RDF::Turtle. A future update to the linkeddata gem should reference the latest versions of each, but a simple gem update will work too.

There is a slight semantic change for repositories to support SPARQL: a context of false should not match a variable context. This is straight out of SPARQL semantics. Repository implementors who have provided custom implementations of #query_pattern should check behavior against rdf-spec version 0.3.4 to verify correct operation.

Next up is a release of SPARQL implemented in pure Ruby. This gem provides full support for SPARQL 1.0 queries.

If you liked this article you can add me to Twitter

Trackbacks for RDF.rb 0.3.4 released