Monthly Archives: December 2010

RDF::RDFa, RDF::RDFXML, and RDF::N3 0.3.0 releases

The Nokogiri-based reader suite for the RDF.rb environment. This version offers substantial performance gains, due to general improvements in RDF.rb as well as a number of improvements in the readers:

General improvements

  • Readers save prefix definitions in :prefixes. Writers use :prefixes, or :standard_prefixes to generate QNames.
  • Readers supports :canonicalize and :validate options

RDF::N3

  • New parser based on Tim-BL’s Predictive Parser supports quoted graphs and variables.
  • Stream-based reader can process an indefinite length input file, vs. the older Treetop-based reader that was a two-pass parser.
  • Substantial performance improvement over previous version, running at about x statements/second on an iMac.
  • From History:
    • New Predictive-Parser based N3 Reader, substantially faster than previous Treetop-based parser
    • RDF.rb 0.3.0 compatibility updates
      • Remove literal_normalization and qname_hacks, add back uri_hacks (until 0.3.0)
      • Use nil for default namespace
      • In Writer
        • Use only :prefixes for creating QNames.
        • Add :standard_prefixes and :default_namespace options.
        • Use “”” for multi-line quotes, or anything including escaped characters
      • In Reader
        • URI canonicalization and validation.
        • Added :canonicalize, and :intern options.
        • Added #prefixes method returning a hash of prefix definitions.
        • Change :strict option to :validate.
        • Add check to ensure that predicates are not literals, it’s not legal in any RDF variant.
    • RSpec 2 compatibility

RDF::RDFXML

    • RDF.rb 0.3.0 compatibility updates
      • Remove literal_normalization and qname_hacks, add back uri_hacks (until 0.3.0)
      • Use nil for default namespace
    • In Writer
      • Use only :prefixes for creating QNames.
      • Add :standard_prefixes and :default_namespace options.
      • Improve Writer#to_qname.
      • Don’t try to translate rdf:_1 to rdf:li due to complex corner cases.
      • Fix problems with XMLLiteral, rdf:type and rdf:nodeID serialization.
    • In Reader
      • URI canonicalization and validation.
      • Added :canonicalize, and :intern options.
      • Change :strict option to :validate.
      • Don’t create unnecessary namespaces.
      • Don’t use regexp to substitute base URI in URI serialization.
      • Collect prefixes when extracting mappings.
    • Literal::XML
      • Add all in-scope namespaces, not just those that seem to be used.
    • RSpec 2 compatibility

RDF::RDFa

    • RDF.rb 0.3.0 compatibility updates
      • Remove literal_normalization and qname_hacks, add back uri_hacks (until 0.3.0)
      • Use nil for default namespace
    • In Writer
      • Use only :prefixes for creating QNames.
      • Add :standard_prefixes and :default_namespace options.
      • Improve Writer#to_qname.
    • In Reader
      • URI canonicalization and validation.
      • Added :canonicalize, and :intern options.
      • Change :strict option to :validate.
      • Don’t create unnecessary namespaces.
      • Don’t use regexp to substitute base URI in URI serialization.
      • Collect prefixes when extracting mappings.
    • Literal::XML
      • Add all in-scope namespaces, not just those that seem to be used.
    • RSpec 2 compatibility