Provided by: librdf-trine-perl_1.019-2_all bug


       RDF::Trine::Serializer::NTriples::Canonical - Canonical representation of an RDF model


       This document describes RDF::Trine::Serializer::NTriples::Canonical version 1.019


         use RDF::Trine::Serializer::NTriples::Canonical;
         my $serializer = RDF::Trine::Serializer::NTriples->new( onfail=>'truncate' );
         $serializer->serialize_model_to_file(FH, $model);


       This module produces a canonical string representation of an RDF graph.  If the graph
       contains blank nodes, sometimes there is no canonical representation that can be produced.
       The 'onfail' option allows you to decide what is done in those circumstances:

       ·       truncate - drop problematic triples and only serialize a subgraph.

       ·       append - append problematic triples to the end of graph. The result will be non-
               canonical. This is the default behaviour.

       ·       space - As with 'append', but leave a blank line separating the canonical and non-
               canonical portions of the graph.

       ·       die - cause a fatal error.

       Other than the 'onfail' option, this package has exactly the same interface as
       RDF::Trine::Serializer::NTriples, providing "serialize_model_to_file" and
       "serialize_model_to_string" methods.

       This package will be considerably slower than the non-canonicalising serializer though, so
       should only be used for small to medium-sized graphs, and only when you need
       canonicalisation (e.g. for side-by-side comparison of two graphs to check they're
       isomorphic; or creating a canonical representation for digital signing).


       Beyond the methods documented below, this class inherits methods from the
       RDF::Trine::Serializer::NTriples class.

       "new ( [ onfail => $rule ] )"
           Returns a new Canonical N-Triples serializer object. If specified, the value of the
           'onfail' argument dictates the handling of blank nodes with no canonical
           representation. The allowable rule values are 'truncate', 'append', 'space', and
           'die', and their respective behaviour is described in "DESCRIPTION" above.

       "serialize_model_to_file ( $fh, $model )"
           Serializes the $model to canonical NTriples, printing the results to the supplied
           filehandle "<$fh">.

       "serialize_model_to_string ( $model )"
           Serializes the $model to canonical NTriples, returning the result as a string.


       Please report any bugs or feature requests to through the GitHub web interface at


       Signing RDF Graphs, Jeremey J Carroll, Digital Media Systems Laboratory, HB Laboratories
       Bristol.  HPL-2003-142, 23 July 2003.

       RDF::Trine, RDF::Trine::Serializer::NTriples.



       Toby Inkster, <>


       Copyright (c) 2010 Toby Inkster

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself, either Perl version 5.8.1 or, at your option, any later version of
       Perl 5 you may have available.

perl v5.28.0                                2018-RDF::Trine::Serializer::NTriples::Canonical(3pm)