NAME

JSON::GRDDL - transform JSON to RDF

SYNOPSIS

 # Low-Level Interface
 #
 my $grddl = JSON::GRDDL->new;
 my @transformations = $grddl->discover($jsondoc, $baseuri);
 foreach my $trans (@transformations)
 {
   my $model = $grddl->transform_by_uri($jsondoc, $baseuri, $trans);
   # $model is an RDF::Trine::Model
 }

 # High-Level Interface
 #
 my $grddl = JSON::GRDDL->new;
 my $model = $grddl->data($jsondoc, $baseuri);
 # $model is an RDF::Trine::Model

DESCRIPTION

This module implements jsonGRDDL, a port of GRDDL concepts from XML to JSON.

jsonGRDDL is described at http://buzzword.org.uk/2008/jsonGRDDL/spec.

This module attempts to provide a similar API to XML::GRDDL but differs in some respects.

Constructor

JSON::GRDDL->new

The constructor accepts no parameters and returns a JSON::GRDDL object.

Methods

$grddl->data($json, $base, %options)

This is usually what you want to call. It's a high-level method that does everything for you and returns the RDF you wanted. $json is the raw JSON source of the document, or an equivalent Perl hashref/arrayref structure. $base is the base URI for resolving relative references.

Returns an RDF::Trine::Model.

$grddl->discover($json, $base, %options)

You only need to call this method if you're doing something unusual.

Processes the JSON document to discover the transformation associated with it. $json is the raw JSON source of the document, or an equivalent Perl hashref/arrayref structure. $base is the base URI for resolving relative references.

Returns a list of URLs as strings.

$grddl->transform_by_uri($json, $base, $transformation, %options)

You only need to call this method if you're doing something unusual.

Transforms a JSON document into RDF using a JsonT transformation, specified by URI. $json is the raw JSON source of the document, or an equivalent Perl hashref/arrayref structure. $base is the base URI for resolving relative references. $transformation is the URI for the JsonT transformation.

Returns an RDF::Trine::Model.

$grddl->transform_by_jsont($json, $base, $code, $name, %options)

You only need to call this method if you're doing something unusual.

Transforms a JSON document into RDF using a JsonT transformation, specified as a Javascript code, variable name pair. $json is the raw JSON source of the document, or an equivalent Perl hashref/arrayref structure. $base is the base URI for resolving relative references. $code and $name must be suitable for passing to the new constructor from the JSON::T package.

Returns an RDF::Trine::Model.

BUGS

Please report any bugs to http://rt.cpan.org/.

SEE ALSO

Specification: http://buzzword.org.uk/2008/jsonGRDDL/spec.

Related modules: JSON, JSON::T, JSON::Path, XML::GRDDL.

http://www.perlrdf.org/.

This module is derived from Swignition http://buzzword.org.uk/swignition/.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

Copyright 2008-2010 Toby Inkster.

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