NAME

       HTML::Embedded::Turtle - embedding RDF in HTML the crazy way

SYNOPSIS

        use HTML::Embedded::Turtle;

        my $het = HTML::Embedded::Turtle->new($html, $base_uri);
        foreach my $graph ($het->endorsements)
        {
          my $model = $het->graph($graph);

          # $model is an RDF::Trine::Model. Do something with it.
        }

DESCRIPTION

       RDF can be embedded in (X)HTML using simple <script> tags. This is described at
       <http://esw.w3.org/N3inHTML>. This gives you a file format that can contain multiple
       (optionally named) graphs. The document as a whole can "endorse" a graph by including:

        <link rel="meta" href="#foo" />

       Where "#foo" is a fragment identifier pointing to a graph.

        <script type="text/turtle" id="foo"> ... </script>

       The rel="meta" stuff is parsed using an RDFa parser, so equivalent RDFa works too.

       This module parses HTML files containing graphs like these, and allows you to access them
       each individually; as a union of all graphs on the page; or as a union of just the
       endorsed graphs.

       Despite the module name, this module supports a variety of <script type>s: text/turtle,
       application/turtle, application/x-turtle text/plain (N-Triples), text/n3 (Notation 3),
       application/x-rdf+json (RDF/JSON), application/json (RDF/JSON), and application/rdf+xml
       (RDF/XML).

       The deprecated attribute "language" is also supported:

        <script language="Turtle" id="foo"> ... </script>

       Languages supported are (case insensitive): "Turtle", "NTriples", "RDFJSON", "RDFXML" and
       "Notation3".

   Constructor
       "HTML::Embedded::Turtle->new($markup, $base_uri, \%opts)"
           Create a new object. $markup is the HTML or XHTML markup to parse; $base_uri is the
           base URI to use for relative references.

           Options include:

           •   markup

               Choose which parser to use: 'html' or 'xml'. The former chooses
               HTML::HTML5::Parser, which can handle tag soup; the latter chooses XML::LibXML,
               which cannot. Defaults to 'html'.

           •   rdfa_options

               A set of options to be parsed to RDF::RDFa::Parser when looking for endorsements.
               See RDF::RDFa::Parser::Config. The default is probably sensible.

   Public Methods
       "union_graph"
           A union graph of all graphs found in the document, as an RDF::Trine::Model.  Note that
           the returned model contains quads.

       "endorsed_union_graph"
           A union graph of only the endorsed graphs, as an RDF::Trine::Model.  Note that the
           returned model contains quads.

       "graph($name)"
           A single graph from the page.

       "graphs"
       "all_graphs"
           A hashref where the keys are graph names and the values are RDF::Trine::Models. Some
           graph names will be URIs, and others may be blank nodes (e.g. "_:foobar").

           "graphs" and "all_graphs" are aliases for each other.

       "endorsed_graphs"
           Like "all_graphs", but only returns endorsed graphs. Note that all endorsed graphs
           will have graph names that are URIs.

       "endorsements"
           Returns a list of URIs which are the names of endorsed graphs. Note that the presence
           of a URI $x in this list does not imply that "$het->graph($x)" will be defined.

       "dom"
           Returns the page DOM.

       "uri"
           Returns the page URI.

BUGS

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

       Please forgive me in advance for inflicting this module upon you.

SEE ALSO

       RDF::RDFa::Parser, RDF::Trine, RDF::TriN3.

       <http://www.perlrdf.org/>.

AUTHOR

       Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENSE

       Copyright (C) 2010-2011, 2013 by Toby Inkster.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.

DISCLAIMER OF WARRANTIES

       THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
       WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
       PURPOSE.