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Daisuke Maki

NAME

XML::RSS::LibXML - XML::RSS with XML::LibXML (parse-only)

SYNOPSIS

  use XML::RSS::LibXML;
  my $rss = XML::RSS::LibXML->new;
  $rss->parsefile($file);

  print "channel: $rss->{channel}->{title}\n";
  foreach my $item (@{ $rss->{items} }) {
     print "  item: $item->{title} ($item->{link})\n";
  }

  # Add custom modules
  $rss->add_module(uri => $uri, prefix => $prefix);

DESCRIPTION

XML::RSS::LibXML uses XML::LibXML (libxml2) for parsing RSS instead of XML::RSS' XML::Parser (expat), while trying to keep interface compatibility with XML::RSS.

XML::RSS is an extremely handy tool, but it is unfortunately not exactly the most lean or efficient RSS parser, especially in a long-running process. So for a long time I had been using my own version of RSS parser to get the maximum speed and efficiency - this is the re-packaged version of that module, such that it adheres to the XML::RSS interface.

XML::RSS::LibXML is NOT 100% compatible with XML::RSS. For example, XML::RSS::LibXML is not capable of outputting RSS in various formats.

Use this module when you have severe performance requirements in parsing RSS files.

PARSED FIELDS

METHODS

new

Creates a new instance of XML::RSS::LibXML

parse($string)

Parse a string containing RSS.

parse_file($filename)

Parse an RSS file specified by $filename

as_string()

Return the string representation of the parsed RSS.

add_module(uri => $uri, prefix => $prefix)

Adds a new module. You should do this before parsing the RSS. XML::RSS::LibXML understands a few modules by default:

    rdf     => "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
    dc      => "http://purl.org/dc/elements/1.1/",
    sy      => "http://purl.org/rss/1.0/modules/syndication/",
    admin   => "http://webns.net/mvcb/",
    content => "http://purl.org/rss/1.0/modules/content/",
    cc      => "http://web.resource.org/cc/",
    taxo    => "http://purl.org/rss/1.0/modules/taxonomy/",

So you do not need to add these explicitly.

PERFORMANCE

Here's a simple benchmark using benchmark.pl in this distribution:

  daisuke@localhost XML-RSS-LibXML$ perl -Mlib=lib benchmark.pl index.rdf 
               Rate        rss rss_libxml
  rss        8.00/s         --       -97%
  rss_libxml  262/s      3172%         --

CAVEATS

No support whatsover for writing RSS. No plans to support it either.

Only first level data under <channel> and <item> tags are examined. So if you have complex data, this module will not pick it up. For most of the cases, this will suffice, though.

TODO

Tests. Currently tests are simply stolen from XML::RSS. It would be nice to have tests that do more extensive testing for correctness

SEE ALSO

XML::RSS, XML::LibXML, XML::LibXML::XPathContext

AUTHORS

Copyright 2005 Daisuke Maki <dmaki@cpan.org>, Tatsuhiko Miyagawa <miyagawa@bulknews.net>. All rights reserved.

Development partially funded by Brazil, Ltd. <http://b.razil.jp>