NAME
    HTML::Data::Parser - parses data embedded in HTML

SYNOPSIS
    Be like Google! Google Rich Snippets supports RDFa, Microdata and
    Microformats, so why shouldn't you?

      use RDF::Trine;
      use HTML::Data::Parser;
  
      my $parser = HTML::Data::Parser->new(
        parse_rdfa         => 1,
        parse_grddl        => 0,
        parse_microformats => undef,
        parse_microdata    => undef,
        parse_n3           => undef,
        );
      my $model  = RDF::Trine::Model->temporary_model;
      my $writer = RDF::Trine::Serializer->new('RDFXML');
  
      $parser->parse_into_model($base_uri, $markup, $model);
      print $writer->serialize_model_to_string($model);

DESCRIPTION
    This module parses data embedded in HTML. It understands the following
    standards and patterns for embedding data:

    *   RDFa <http://www.w3.org/TR/rdfa-syntax/>

    *   Microformats <http://microformats.org/>

    *   GRDDL <http://www.w3.org/TR/grddl/>

    *   Microdata <http://www.w3.org/TR/microdata/>

    *   N3-in-HTML <http://esw.w3.org/N3inHTML>

    This module is just a wrapper around RDF::RDFa::Parser,
    HTML::Microformats, XML::GRDDL, HTML::HTML5::Microdata::Parser and
    HTML::Embedded::Turtle. It is a subclass of RDF::Trine::Parser so
    inherits the same interface as that.

  Constructor Options
    The methods presented by an HTML::Data::Parser object are exactly the
    same as any other common-or-garden RDF::Trine::Parser object. The
    constructor options are where it gets interesting.

    The options accepted are:

    *   dom_parser - set to 'xml' or 'html5' to determine which parser to
        use on input strings. Defaults to 'html5'.

    *   named_graphs - boolean; whether to return quads to handler in
        "parse" method. For advanced use only.

    *   on_error - what to do when an error occurs. (Currently only a subset
        of all possible errors are covered by this option. Some errors
        thrown by other modules won't be caught.) Set to 'warn', 'die',
        'ignore' or a callback coderef (which is passed one parameter - the
        error message as a string). Defaults to 'warn'.

    *   options_microdata - a hashref of options to pass through to
        "HTML::HTML5::Microdata::Parser->new" if/when parsing microdata.

    *   options_rdfa - an RDF::RDFa::Parser::Config object to use if/when
        parsing RDFa.

    *   parse_grddl - a "troolean" (yes/no/maybe-so). Set to true to
        indicate that you want GRDDL to be parsed. Set to false to indicate
        that you want it to be ignored. Set to undef if you don't really
        care: this will parse GRDDL if the required module (XML::GRDDL) is
        installed and working, but won't complain if it's not. Defaults to
        false.

    *   parse_microdata - another troolean. Defaults to undef.

    *   parse_microformats - another troolean. Defaults to undef.

    *   parse_n3 - another troolean. Defaults to undef.

    *   parse_rdfa - another troolean. Defaults to 1.

SEE ALSO
    This module is just a wrapper around: RDF::RDFa::Parser,
    HTML::Microformats, XML::GRDDL, HTML::HTML5::Microdata::Parser,
    HTML::Embedded::Turtle.

    And around these DOM parsers: HTML::HTML5::Parser, XML::LibXML.

    It sits on top of Trine: RDF::Trine, RDF::Trine::Parser,
    RDF::TrineShortcuts.

    For more information on processing web data in Perl:
    <http://www.perlrdf.org/>.

AUTHOR
    Toby Inkster <tobyink@cpan.org>.

COPYRIGHT
    Copyright 2010 Toby Inkster

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

