RDF::Trine::Graph3pm

Usage

  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");

Version

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

Overview

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.