1XML::Feed(3) User Contributed Perl Documentation XML::Feed(3)
2
6 XML::Feed - Syndication feed parser and auto-discovery
7
9 use XML::Feed;
10 my $feed = XML::Feed->parse(URI->new('http://example.com/atom.xml'))
11 or die XML::Feed->errstr;
12 print $feed->title, "\n";
13 for my $entry ($feed->entries) {
14 }
15 ## Find all of the syndication feeds on a given page, using
17 ## auto-discovery.
18 my @feeds = XML::Feed->find_feeds('http://example.com/');
19
21 XML::Feed is a syndication feed parser for both RSS and Atom feeds. It
22 also implements feed auto-discovery for finding feeds, given a URI.
23 XML::Feed supports the following syndication feed formats:
25 • RSS 0.91
27 • RSS 1.0
29 • RSS 2.0
31 • Atom
33 The goal of XML::Feed is to provide a unified API for parsing and using
35 the various syndication formats. The different flavors of RSS and Atom
36 handle data in different ways: date handling; summaries and content;
37 escaping and quoting; etc. This module attempts to remove those
38 differences by providing a wrapper around the formats and the classes
39 implementing those formats (XML::RSS and XML::Atom::Feed). For example,
40 dates are handled differently in each of the above formats. To provide
41 a unified API for date handling, XML::Feed converts all date formats
42 transparently into DateTime objects, which it then returns to the
43 caller.
44
46 XML::Feed->new($format)
47 Creates a new empty XML::Feed object using the format $format.
48 $feed = XML::Feed->new('Atom');
50 $feed = XML::Feed->new('RSS');
51 $feed = XML::Feed->new('RSS', version => '0.91');
52 XML::Feed->parse($stream)
54 XML::Feed->parse($stream, $format)
55 Parses a syndication feed identified by $stream and returns an
56 XML::Feed object. $stream can be any one of the following:
57 • Scalar reference
59 A reference to string containing the XML body of the feed.
61 • Filehandle
63 An open filehandle from which the feed XML will be read.
65 • File name
67 The name of a file containing the feed XML.
69 • URI object
71 A URI from which the feed XML will be retrieved.
73 $format allows you to override format guessing.
75 XML::Feed->get_file($filename)
77 Gets a feed from a file.
78 CML::Feed->get_fh($fh)
80 Gets a feed from pre-opened filehandle.
82 XML::Feed->get_uri($uri)
84 Gets a feed from a URI.
85 XML::Feed->find_feeds($uri)
87 Given a URI $uri, use auto-discovery to find all of the feeds linked
88 from that page (using <link> tags).
89 Returns a list of feed URIs.
91 XML::Feed->identify_format(\$xml)
93 Given the xml of a feed return what format it is in, with "Atom" or
94 "RSS" for all versions of RSS. Note that you pass in a scalar ref to
95 the xml string.
96 $feed->convert($format)
98 Converts the XML::Feed object into the $format format, and returns the
99 new object.
100 $feed->splice($other_feed)
102 Splices in all of the entries from the feed $other_feed into $feed,
103 skipping posts that are already in $feed.
104 $feed->format
106 Returns the format of the feed ("Atom", or some version of "RSS").
107 $feed->title([ $title ])
109 The title of the feed/channel.
110 $feed->base([ $base ])
112 The url base of the feed/channel.
113 $feed->link([ $uri ])
115 The permalink of the feed/channel.
116 $feed->tagline([ $tagline ])
118 The description or tagline of the feed/channel.
119 $feed->description([ $description ])
121 Alias for $feed->tagline.
122 $feed->author([ $author ])
124 The author of the feed/channel.
125 $feed->language([ $language ])
127 The language of the feed.
128 $feed->copyright([ $copyright ])
130 The copyright notice of the feed.
131 $feed->modified([ $modified ])
133 A DateTime object representing the last-modified date of the feed.
134 If present, $modified should be a DateTime object.
136 $feed->generator([ $generator ])
138 The generator of the feed.
139 $feed->self_link ([ $uri ])
141 The Atom Self-link of the feed:
142 <http://validator.w3.org/feed/docs/warning/MissingAtomSelfLink.html>
144 A string.
146 $feed->entries
148 A list of the entries/items in the feed. Returns an array containing
149 XML::Feed::Entry objects.
150 $feed->items
152 A synonym (alias) for "$feed->entries".
153 $feed->add_entry($entry)
155 Adds an entry to the feed. $entry should be an XML::Feed::Entry object
156 in the correct format for the feed.
157 $feed->as_xml
159 Returns an XML representation of the feed, in the format determined by
160 the current format of the $feed object.
161 $feed->first_link ([ $uri ])
163 The Atom First-link for feed paging and archiving (RFC 5005).
164 <http://tools.ietf.org/html/rfc5005>
166 $feed->last_link ([ $uri ])
168 The Atom Last-link for feed paging and archiving.
169 $feed->next_link ([ $uri ])
171 The Atom Next-link for feed paging and archiving.
172 $feed->previous_link ([ $uri ])
174 The Atom Previous-link for feed paging and archiving.
175 $feed->current_link ([ $uri ])
177 The Atom Current-link for feed paging and archiving.
178 $feed->next_archive_link ([ $uri ])
180 The Atom Next-link for feed paging and archiving.
181 $feed->prev_archive_link ([ $uri ])
183 The Atom Prev-Archive-link for feed paging and archiving.
184
186 $XML::Feed::Format::RSS::PREFERRED_PARSER
187 If you want to use another RSS parser class than XML::RSS
188 (default), you can change the class by setting $PREFERRED_PARSER
189 variable in the XML::Feed::Format::RSS package.
190 $XML::Feed::Format::RSS::PREFERRED_PARSER = "XML::RSS::LibXML";
192 Note: this will only work for parsing feeds, not creating feeds.
194 Note: Only "XML::RSS::LibXML" version 0.3004 is known to work at
196 the moment.
197 $XML::Feed::MULTIPLE_ENCLOSURES
199 Although the RSS specification states that there can be at most one
200 enclosure per item some feeds break this rule.
201 If this variable is set then "XML::Feed" captures all of them and
203 makes them available as a list.
204 Otherwise it returns the last enclosure parsed.
206 Note: "XML::RSS" version 1.44 is needed for this to work.
208
210 For reference, this cgi script will create valid, albeit nonsensical
211 feeds (according to "http://feedvalidator.org" anyway) for Atom 1.0 and
212 RSS 0.90, 0.91, 1.0 and 2.0.
213 #!perl -w
215 use strict;
217 use CGI;
218 use CGI::Carp qw(fatalsToBrowser);
219 use DateTime;
220 use XML::Feed;
221 my $cgi = CGI->new;
223 my @args = ( $cgi->param('format') // "Atom" );
224 push @args, ( version => $cgi->param('version') ) if $cgi->param('version');
225 my $feed = XML::Feed->new(@args);
227 $feed->id("http://".time.rand()."/");
228 $feed->title('Test Feed');
229 $feed->link($cgi->url);
230 $feed->self_link($cgi->url( -query => 1, -full => 1, -rewrite => 1) );
231 $feed->modified(DateTime->now);
232 my $entry = XML::Feed::Entry->new();
234 $entry->id("http://".time.rand()."/");
235 $entry->link("http://example.com");
236 $entry->title("Test entry");
237 $entry->summary("Test summary");
238 $entry->content("Foo");
239 $entry->modified(DateTime->now);
240 $entry->author('test@example.com (Testy McTesterson)');
241 $feed->add_entry($entry);
242 my $mime = ("Atom" eq $feed->format) ? "application/atom+xml" : "application/rss+xml";
244 print $cgi->header($mime);
245 print $feed->as_xml;
246
248 XML::Feed is free software; you may redistribute it and/or modify it
249 under the same terms as Perl itself.
250
252 Except where otherwise noted, XML::Feed is Copyright 2004-2008 Six
253 Apart. All rights reserved.
254
256 For support contact the XML::Feed mailing list -
257 xml-feed@perlhacks.com.
258
260 The latest version of XML::Feed can be found at
261 http://github.com/davorg/XML-Feed
263perl v5.34.0 2022-01-21 XML::Feed(3)