RSS enclosure

RSS enclosures are a way of attaching multimedia content to RSS feeds with the purpose of allowing that content to be prefetched.[1] Enclosures provide the URL of a file associated with an entry, such as an MP3 file to a music recommendation or a photo to a diary entry. Unlike e-mail attachments, enclosures are merely hyperlinks to files. The actual file data is not embedded into the feed (unless a data URL is used). Support and implementation among aggregators varies: if the software understands the specified file format, it may automatically download and display the content, otherwise provide a link to it or silently ignore it.

The addition of enclosures to RSS, as first implemented by Dave Winer in late 2000 [1], was an important prerequisite for the emergence of podcasting, perhaps the most common use of the feature (As of 2012). In podcasts and related technologies enclosures are not merely attachments to entries, but provide the main content of a feed.

## Contents

* 1 Syntax
* 2 Prefetching
* 3 See also
* 4 References
* 5 External links

## Syntax

In RSS 2.0, the syntax for the <enclosure> tag, an optional child of the <item> element, is as follows:

<enclosure url="http://example.com/file.mp3" length="123456789" type="audio/mpeg" />

where the value of the url attribute is a URL of a file, length is its size in bytes, and type its mime type.

It is recommended that only one <enclosure> element is included per <item>.[2]

## Prefetching

Main page: Link prefetching

The RSS <enclosure> has similarities to:

* the SMIL <prefetch> element,
* the HTML <link> element with rel="prefetch".[2]
* the HTTP Link header with rel="prefetch". (See RFC 2068 section 19.6.2.4.)
* the Atom <link> element with rel="enclosure"

## See also

* Broadcatching
* Internet television
* Podcast
* Photofeed
* Vlog

## References

1. ↑ "RSS Enclosures Use Case". https://www.rssboard.org/rss-enclosures-use-case.
2. ↑ "RSS Best Practices Profile". http://www.rssboard.org/rss-profile#element-channel-item-enclosure.

## External links

* The <enclosure> tag in the RSS 2.0 specification
* mod_enclosure \- Enclosures in RSS 1.x
* Enclosure intended use case

* v
* t
* e

News aggregators

Client
software|

| Standalone|

* Akregator
* BlogBridge
* FeedDemon
* Feedreader
* Flipboard
* Genieo
* Google Currents
* Google News
* Liferea
* NetNewsWire
* NewsAccess
* Newsbeuter
* NewsFire
* QuiteRSS
* RSS Bandit
* RSSOwl
* Seesmic
* Vable
* WebFetch

|

Web browsers|

* AOL Explorer
* Avant Browser
* Basilisk
* Camino
* iCab
* Flock
* Internet Explorer
* K-Meleon
* Kazehakase
* Maxthon
* Firefox
* GNOME Web
* Netscape Browser
* Netscape Navigator 9
* OmniWeb
* Opera
* Pale Moon
* Safari
* SeaMonkey
* Shiira
* Sleipnir
* Tencent Traveler
* Vivaldi
* Waterfox

Email clients|

* Apple Mail
* Claws Mail
* Gnus
* IBM Notes
* Microsoft Outlook
* Mozilla Thunderbird
* Netscape Messenger 9
* Opera Mail
* Pegasus Mail
* The Bat!
* Windows Live Mail
* Zimbra

Web browser plugins|

* Cooliris
* Sage

Web apps or
mobile apps|

* Bloglines
* CommaFeed
* Cheetah News
* Daylife
* Digg Reader
* Drupal
* Feedbin
* Feedly
* FriendFeed
* Google News
* Google Reader
* iGoogle
* dotCMS
* Imooty.eu
* Magnolia
* My Yahoo!
* News360
* NewsBlur
* Newsknowledge
* Netvibes
* Pageflakes
* Planet
* Pulse
* Rojo.com
* Prismatic
* Spokeo
* The Old Reader
* Tiny Tiny RSS
* TweetDeck
* WebGUI
* Windows Live Personalized Experience
* winnowTag

Media
aggregators|

| Podcatcher|

* Adobe Media Player
* Akregator
* Amarok
* Flock
* iTunes
* Juice
* MediaMonkey
* Miro
* Rhythmbox
* Songbird
* Winamp
* Zune

|

RSS+BitTorrent|

* BitLord
* BitTorrent 6
* Deluge
* Miro
* Opera Mail
* qBittorrent
* TorrentFlux
* Tribler
* μTorrent
* Vuze

Related
articles|

* Comparison of feed aggregators
* History of Media aggregation
* RSS enclosure

Italics indicate discontinued software.

* v
* t
* e

Web syndication

History
Blogging
Podcasting
Vlogging
Web syndication technology

Types|

* Art
* Bloggernacle
* Classical music
* Corporate
* Dream diary
* Edublog
* Electronic journal
* Fake
* Family
* Fashion
* Food
* Health
* Law
* Lifelog
* Litblog
* MP3
* News
* Photoblog
* Police
* Political
* Prayer
* Project
* Reverse
* Travel
* Warblog

Technology|

| General|

* BitTorrent
* Feed URI scheme

|

Features|

* Linkback
* Permalink
* Ping
* Pingback
* Reblogging
* Refback
* Rollback
* Trackback

Mechanism|

* Conversation threading
* Geotagging
* RSS enclosure
* Synchronization

Memetics|

* Atom feed
* Data feed
* Photofeed
* Product feed
* RDF feed
* Web feed

RSS|

* GeoRSS
* MRSS
* RSS TV

Social|

* Inter-process communication
* Livemark
* Mashup
* Referencing
* RSS editor
* RSS tracking
* Streaming media

Standard|

* OML
* OPML
* RSS Advisory Board
* Usenet
* World Wide Web
* XBEL
* XOXO

Form|

* Audio podcast
* Enhanced podcast
* Mobilecast
* Narrowcasting
* Peercasting
* Screencast
* Slidecasting
* Videocast
* Webcomic
* Webtoon
* Web series

* Anonymous blogging
* Collaborative blog
* Columnist
* Instant messaging
* Liveblogging
* Microblog
* Mobile blogging
* Roblog
* Spam blog
* Video blogging
* Motovlogging

Media|

| Alternative media|

* Carnivals
* Fiction
* Journalism
* Citizen
* Database
* Online diary
* Search engines
* Sideblog
* Software
* Web directory

|

Micromedia|

* Aggregation
* News
* Poll
* Review
* Search
* Video
* Atom
* AtomPub
* Broadcatching
* Hashtag
* NewsML
* 1
* G2
* Social communication
* Social software
* Web Slice

Related|

* Blogosphere
* Escribitionist
* Glossary of blogging
* Pay per click
* Posting style
* Slashdot effect
* Spam in blogs
* Uses of podcasting

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