RSS enclosure

Short description: Pointer to a media file from a web feed

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[update]. 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 article: 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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