NAME

       RDF::Trine::Graph - Materialized RDF Graphs for testing isomorphism

VERSION

       This document describes RDF::Trine::Graph version 1.019

SYNOPSIS

         use RDF::Trine::Graph;
         my $a = RDF::Trine::Graph->new( $model_a );
         my $b = RDF::Trine::Graph->new( $model_b );
         print "graphs are " . ($a->equals( $b ) ? "the same" : "different");

DESCRIPTION

       RDF::Trine::Graph provdes a mechanism for testing graph isomorphism based on graph triples
       from either a RDF::Trine::Model or a RDF::Trine::Iterator.  Isomorphism testing requires
       materializing all of a graph's triples in memory, and so should be used carefully in
       situations with large graphs.

METHODS

       "new ( $model )"
       "new ( $iterator )"
           Returns a new graph from the given RDF::Trine::Model or RDF::Trine::Iterator::Graph
           object.

       "equals ( $graph )"
           Returns true if the invocant and $graph represent two equal RDF graphs (e.g.  there
           exists a bijection between the RDF statements of the invocant and $graph).

       "is_subgraph_of ( $graph )"
           Returns true if the invocant is a subgraph of $graph. (i.e. there exists an injection
           of RDF statements from the invocant to $graph.)

       "injection_map ( $graph )"
           If the invocant is a subgraph of $graph, returns a mapping of blank node identifiers
           from the invocant graph to $graph as a hashref. Otherwise returns false. The solution
           is not always unique; where there exist multiple solutions, the solution returned is
           arbitrary.

       "split_blank_statements"
           Returns two array refs, containing triples with blank nodes and triples without any
           blank nodes, respectively.

       "get_statements"
           Returns a RDF::Trine::Iterator::Graph object for the statements in this graph.

       "error"
           Returns an error string explaining the last failed "equal" call.

BUGS

       Please report any bugs or feature requests to through the GitHub web interface at
       <https://github.com/kasei/perlrdf/issues>.

AUTHOR

       Gregory Todd Williams  "<gwilliams@cpan.org>"

COPYRIGHT

       Copyright (c) 2006-2012 Gregory Todd Williams. This program is free software; you can
       redistribute it and/or modify it under the same terms as Perl itself.