---
name: "RDF::Trine::Graph"
section: "3pm"
platform: "linux"
package: "librdf-trine-perl"
version: "1.019-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/RDF::Trine::Graph"
---

# RDF::Trine::Graph(3pm)

Materialized RDF Graphs for testing isomorphism

## 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.