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Old 05-05-2008
Tim Bray provides a bridge between Sun and developers
Mon, 05 May 2008 20:00:00 GMT
"I'm a genuine old fart," says Tim Bray as he looks back at his three decades in computing. Widely known for his standards work on XML and the Atom syndication format, at an age when many former developers have moved entirely into management, he seems to have found a niche that takes advantage of his experience. As director of Web technologies at Sun Microsystems, his job is to keep current with Web and general programming and to encourage adaptation of new developments within the corporation. At the recent Open Web Vancouver conference, Bray talked to Linux.com about how he fills his role at Sun, and the trends he sees in computing.


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LEARN ABOUT DEBIAN

xml::feed

XML::Feed(3pm)						User Contributed Perl Documentation					    XML::Feed(3pm)

NAME

       XML::Feed - Syndication feed parser and auto-discovery

SYNOPSIS

	   use XML::Feed;
	   my $feed = XML::Feed->parse(URI->new('http://example.com/atom.xml'))
	       or die XML::Feed->errstr;
	   print $feed->title, "
";
	   for my $entry ($feed->entries) {
	   }

	   ## Find all of the syndication feeds on a given page, using
	   ## auto-discovery.
	   my @feeds = XML::Feed->find_feeds('http://example.com/');

DESCRIPTION

       XML::Feed is a syndication feed parser for both RSS and Atom feeds. It also implements feed auto-discovery for finding feeds, given a URI.

       XML::Feed supports the following syndication feed formats:

       o   RSS 0.91

       o   RSS 1.0

       o   RSS 2.0

       o   Atom

       The goal of XML::Feed is to provide a unified API for parsing and using the various syndication formats. The different flavors of RSS and
       Atom handle data in different ways: date handling; summaries and content; escaping and quoting; etc. This module attempts to remove those
       differences by providing a wrapper around the formats and the classes implementing those formats (XML::RSS and XML::Atom::Feed). For
       example, dates are handled differently in each of the above formats. To provide a unified API for date handling, XML::Feed converts all
       date formats transparently into DateTime objects, which it then returns to the caller.

USAGE

   XML::Feed->new($format)
       Creates a new empty XML::Feed object using the format $format.

	   $feed = XML::Feed->new('Atom');
	   $feed = XML::Feed->new('RSS');
	   $feed = XML::Feed->new('RSS', version => '0.91');

   XML::Feed->parse($stream)
   XML::Feed->parse($stream, $format)
       Parses a syndication feed identified by $stream and returns an XML::Feed obhect. $stream can be any one of the following:

       o   Scalar reference

	   A reference to string containing the XML body of the feed.

       o   Filehandle

	   An open filehandle from which the feed XML will be read.

       o   File name

	   The name of a file containing the feed XML.

       o   URI object

	   A URI from which the feed XML will be retrieved.

       $format allows you to override format guessing.

   XML::Feed->find_feeds($uri)
       Given a URI $uri, use auto-discovery to find all of the feeds linked from that page (using <link> tags).

       Returns a list of feed URIs.

   XML::Feed->identify_format($xml)
       Given the xml of a feed return what format it is in ("Atom", or some version of "RSS").

   $feed->convert($format)
       Converts the XML::Feed object into the $format format, and returns the new object.

   $feed->splice($other_feed)
       Splices in all of the entries from the feed $other_feed into $feed, skipping posts that are already in $feed.

   $feed->format
       Returns the format of the feed ("Atom", or some version of "RSS").

   $feed->title([ $title ])
       The title of the feed/channel.

   $feed->base([ $base ])
       The url base of the feed/channel.

   $feed->link([ $uri ])
       The permalink of the feed/channel.

   $feed->tagline([ $tagline ])
       The description or tagline of the feed/channel.

   $feed->description([ $description ])
       Alias for $feed->tagline.

   $feed->author([ $author ])
       The author of the feed/channel.

   $feed->language([ $language ])
       The language of the feed.

   $feed->copyright([ $copyright ])
       The copyright notice of the feed.

   $feed->modified([ $modified ])
       A DateTime object representing the last-modified date of the feed.

       If present, $modified should be a DateTime object.

   $feed->generator([ $generator ])
       The generator of the feed.

   $feed->self_link ([ $uri ])
       The Atom Self-link of the feed:

       <http://validator.w3.org/feed/docs/warning/MissingAtomSelfLink.html>

       A string.

   $feed->entries
       A list of the entries/items in the feed. Returns an array containing XML::Feed::Entry objects.

   $feed->items
       A synonym (alias) for <$feed->entries>.

   $feed->add_entry($entry)
       Adds an entry to the feed. $entry should be an XML::Feed::Entry object in the correct format for the feed.

   $feed->as_xml
       Returns an XML representation of the feed, in the format determined by the current format of the $feed object.

PACKAGE VARIABLES

       $XML::Feed::Format::RSS::PREFERRED_PARSER
	   If you want to use another RSS parser class than XML::RSS (default), you can change the class by setting $PREFERRED_PARSER variable in
	   the XML::Feed::Format::RSS package.

	       $XML::Feed::Format::RSS::PREFERRED_PARSER = "XML::RSS::LibXML";

	   Note: this will only work for parsing feeds, not creating feeds.

	   Note: Only "XML::RSS::LibXML" version 0.3004 is known to work at the moment.

       $XML::Feed::MULTIPLE_ENCLOSURES
	   Although the RSS specification states that there can be at most one enclosure per item some feeds break this rule.

	   If this variable is set then "XML::Feed" captures all of them and makes them available as a list.

	   Otherwise it returns the last enclosure parsed.

	   Note: "XML::RSS" version 1.44 is needed for this to work.

VALID FEEDS

       For reference, this cgi script will create valid, albeit nonsensical feeds (according to "http://feedvalidator.org" anyway) for Atom 1.0
       and RSS 0.90, 0.91, 1.0 and 2.0.

	   #!perl -w

	   use strict;
	   use CGI;
	   use CGI::Carp qw(fatalsToBrowser);
	   use DateTime;
	   use XML::Feed;

	   my $cgi  = CGI->new;
	   my @args = ( $cgi->param('format') || "Atom" );
	   push @args, ( version => $cgi->param('version') ) if $cgi->param('version');

	   my $feed = XML::Feed->new(@args);
	   $feed->id("http://".time.rand()."/");
	   $feed->title('Test Feed');
	   $feed->link($cgi->url);
	   $feed->self_link($cgi->url( -query => 1, -full => 1, -rewrite => 1) );
	   $feed->modified(DateTime->now);

	   my $entry = XML::Feed::Entry->new();
	   $entry->id("http://".time.rand()."/");
	   $entry->link("http://example.com");
	   $entry->title("Test entry");
	   $entry->summary("Test summary");
	   $entry->content("Foo");
	   $entry->modified(DateTime->now);
	   $entry->author('test@example.com (Testy McTesterson)');
	   $feed->add_entry($entry);

	   my $mime = ("Atom" eq $feed->format) ? "application/atom+xml" : "application/rss+xml";
	   print $cgi->header($mime);
	   print $feed->as_xml;

LICENSE

       XML::Feed is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR &; COPYRIGHT
       Except where otherwise noted, XML::Feed is Copyright 2004-2008 Six Apart, cpan@sixapart.com. All rights reserved.

SUBVERSION

       The latest version of XML::Feed can be found at

	   http://code.sixapart.com/svn/XML-Feed/trunk/

perl v5.14.2							    2012-03-21							    XML::Feed(3pm)