RDF::Query - A SPARQL/RDQL implementation for RDF::Redland and RDF::Core

RDF::Query allows RDQL and SPARQL queries to be run against an RDF model, returning rows of matching results.

Requirements

To install RDF::Query you'll need the following perl modules installed:

• Parse::RecDescent
• LWP::Simple
• RDF::Core or RDF::Redland

Installing RDF::Query

To install, run:

Version History

Version 1.012 (2005-04-24)

• Stream objects now handle being constructed with an undef coderef.
• Streams are now objects usinig the Redland QueryResult API.
• RDF namespace is now always available in queries.
• row() now uses a stream when calling execute().
• Added ORDER BY support to RDQL parser.
• SPARQL constraints now properly use the 'FILTER' keyword.
• SPARQL constraints can now use '&&' as an operator.
• SPARQL namespace declaration is now optional.
• Updated tests.

Version 1.010 (2005-04-21)

• execute now returns an iterator
• Added core support for DISTINCT, LIMIT, OFFSET
• Added initial core support for ORDER BY (only works on one column right now)
• Broke out the query parser into it's own RDQL class
• Added initial support for a SPARQL parser
  • Added support for blank nodes
  • Added lots of syntactic sugar (with blank nodes, multiple predicates and objects)
  • Added SPARQL support for DISTINCT and ORDER BY
• Moved model-specific code into RDF::Query::Model::*
• Moving over to redland's query API (pass in the model when query is executed)

Copyright

Copyright © 2005 Gregory Williams. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.