NAME

RDF::RDB2RDF::R2RML - map relational database to RDF using R2RML

SYNOPSIS

my $mapper = RDF::RDB2RDF::R2RML->new($r2rml);
print $mapper->process_turtle($dbh);

DESCRIPTION

This class offers support for W3C R2RML, based on the 20 Sept 2011 working draft. See the BUGS section below for a list on unimplemented areas.

This is a subclass of RDF::RDB2RDF::Simple. Differences noted below...

Constructor

• new($r2rml)>>

  A single parameter is expected, this can either be an R2RML document as a Turtle string, or an RDF::Trine::Model containing R2RML data. If a Turtle string, then the namespaces from it are also kept.

Methods

• process_turtle($dbh, %options)

  The mapping is included as an R2RML comment at the top of the Turtle. Passing no_r2rml => 1 can disable that feature.

BUGS

Limitations

• rr:RefObjectMap, rr:parentTriplesMap, rr:joinCondition, rr:JoinCondition, rr:child, rr:parent are not yet supported.

• rr:defaultGraph is not understood.

• Scoping of blank nodes across graphs is incorrect.

• Datatype conversions probably not done correctly.

SEE ALSO

RDF::Trine, RDF::RDB2RDF, RDF::RDB2RDF::Simple.

http://perlrdf.org/.

http://www.w3.org/TR/2011/WD-r2rml-20110920/.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT

Copyright 2011 Toby Inkster

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.