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NAME

       HTML::HTML5::Outline - implementation of the HTML5 Outline algorithm

SYNOPSIS

               use JSON;
               use HTML::HTML5::Outline;

               my $html = <<'HTML';
               <!doctype html>
               <h1>Hello</h1>
               <h2>World</h2>
               <h1>Good Morning</h1>
               <h2>Vietnam</h2>
               HTML

               my $outline = HTML::HTML5::Outline->new($html);
               print to_json($outline->to_hashref, {pretty=>1,canonical=>1});

DESCRIPTION

       This is an implementation of the HTML5 Outline algorithm, as per
       <http://www.w3.org/TR/html5/sections.php#outlines>.

       The module can output a JSON-friendly hashref, or an RDF model.

   Constructor
       ·   "HTML::HTML5::Outline->new($html, %options)"

           Construct a new outline. $html is the HTML to generate an outline
           from, either as an HTML or XHTML string, or as an
           XML::LibXML::Document object.

           Options:

           ·   default_language - default language to assume text is in when
               no lang/xml:lang attribute is available. e.g. 'en-gb'.

           ·   element_subjects - rather advanced feature that doesn't bear
               explaining. See USE WITH RDF::RDFA::PARSER for an example.

           ·   microformats - support "<ul class="xoxo">", "<ol class="xoxo">"
               and "<whatever class="figure">" as sectioning elements (like
               "<section>", "<figure>", etc).  Boolean, defaults to false.

           ·   parser - 'html' (default) or 'xml' - choose the parser to use
               for XHTML/HTML. If the constructor is passed an
               XML::LibXML::Document, this is ignored.

           ·   suppress_collections - allows rdf:List stuff to be suppressed
               from RDF output. RDF output - especially in Turtle format -
               looks somewhat nicer without them, but if you care about the
               order of headings and sections, then you'll want them. Boolean,
               defaults to false.

           ·   uri - the document URI for resolving relative URI references.
               Only really used by the RDF output.

   Object Methods
       ·   "to_hashref"

           Returns data as a nested hashref/arrayref structure. Dump it as
           JSON and you'll figure out the format pretty easily.

       ·   "to_rdf"

           Returns data as a n RDF::Trine::Model. Requires RDF::Trine to be
           installed. Otherwise this method won't exist.

       ·   "primary_outlinee"

           Returns a HTML::HTML5::Outline::Outlinee element representing the
           outline for the page.

   Class Methods
       ·   "has_rdf"

           Indicates whether the "to_rdf" object method exists.

USE WITH RDF::RDFA::PARSER

       This module produces RDF data where many of the resources described are
       HTML elements. RDFa data typically does not, but RDF::RDFa::Parser does
       also support some extensions to RDFa which do (e.g. support for the
       "cite" and "role" attributes). It's useful to combine the RDF data from
       each, and RDF::RDFa::Parser 1.093 and upwards contains a few shims to
       make this possible.

       Without further ado...

               use HTML::HTML5::Outline;
               use RDF::RDFa::Parser 1.093;
               use RDF::TrineShortcuts;

               my $rdfa = RDF::RDFa::Parser->new(
                       $html_source,
                       $base_url,
                       RDF::RDFa::Parser::Config->new(
                               'html5', '1.1',
                               role_attr     => 1,
                               cite_attr     => 1,
                               longdesc_attr => 1,
                               ),
                       )->consume;

               my $outline = HTML::HTML5::Outline->new(
                       $rdfa->dom,
                       uri              => $rdfa->uri,
                       element_subjects => $rdfa->element_subjects,
                       );

               # Merging two graphs is pretty complicated in RDF::Trine
               # but a little easier with RDF::TrineShortcuts...
               my $combined = rdf_parse();
               rdf_parse($rdfa->graph,     model => $combined);
               rdf_parse($outline->to_rdf, model => $combined);

               my $NS = {
                       dc    => 'http://purl.org/dc/terms/',
                       o     => 'http://ontologi.es/outline#',
                       type  => 'http://purl.org/dc/dcmitype/',
                       xs    => 'http://www.w3.org/2001/XMLSchema#',
                       xhv   => 'http://www.w3.org/1999/xhtml/vocab#',
                       };

               print rdf_string($combined => 'Turtle', namespaces => $NS);

SEE ALSO

       HTML::HTML5::Outline::RDF, HTML::HTML5::Outline::Outlinee,
       HTML::HTML5::Outline::Section.

       HTML::HTML5::Parser, HTML::HTML5::Sanity.

AUTHOR

       Toby Inkster, <tobyink@cpan.org>

ACKNOWLEDGEMENTS

       This module is a fork of the document structure parser from Swignition
       <http://buzzword.org.uk/swignition/>.

       That in turn includes the following credits: thanks to Ryan King and
       Geoffrey Sneddon for pointing me towards [the HTML5] algorithm. I also
       used Geoffrey's python implementation as a crib sheet to help me figure
       out what was supposed to happen when the HTML5 spec was ambiguous.

COPYRIGHT AND LICENCE

       Copyright (C) 2008-2011 by Toby Inkster

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



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