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Tag Metadata in Feeds

2008 Aug 25, 10:13

As noted previously, my page consists of the aggregation of my various feeds and in working on that code recently it was again brought to my attention that everyone has different ways of representing tag metadata in feeds. I made up a list of how my various feed sources represent tags and list that data here so that it might help others in the future.

Tag markup from various sources
Source Feed Type Tag Markup Scheme One Tag Per Element Tag Scheme URI Human / Machine Names Example Markup
LiveJournal Atom atom:category yes no no , (source)
LiveJournal RSS 2.0 rss2:category yes no no technical
(soure)
WordPress RSS 2.0 rss2:category yes no no , (source)
Delicious RSS 1.0 dc:subject no no no photosynth photos 3d tool
(source)
Delicious RSS 2.0 rss2:category yes yes no domain="http://delicious.com/SequelGuy/">
hulu

(source)
Flickr Atom atom:category yes yes no term="seattle"
scheme="http://www.flickr.com/photos/tags/" />

(source)
Flickr RSS 2.0 media:category no yes no scheme="urn:flickr:tags">
seattle washington baseball mariners

(source)
YouTube RSS 2.0 media:category no no no label="Tags">
bunny rabbit yawn cadbury

(source)
LibraryThing RSS 2.0 No explicit tag metadata. no no no n/a, (source)
Tag markup scheme
Tag Markup Scheme Notes Example
Atom Category
atom:category
xmlns:atom="http://www.w3.org/2005/Atom"
category/@term
Required category name.
category/@scheme
Optional IRI id'ing the categorization scheme.
category/@label
Optional human readable category name.
term="catName"
scheme="tag:deletethis.net,2008:tagscheme"
label="category name in human readable format"/>
RSS 2.0 category
rss2:category
empty namespace
category/@domain
Optional string id'ing the categorization scheme.
category/text()
Required category name. The value of the element is a forward-slash-separated string that identifies a hierarchic location in the indicated taxonomy. Processors may establish conventions for the interpretation of categories.
domain="tag:deletethis.net,2008:tagscheme">
MSFT
Yahoo Media RSS Module category
media:category
xmlns:media="http://search.yahoo.com/mrss/"
category/text()
Required category name.
category/@domain
Optional string id'ing the categorization scheme.
scheme="http://dmoz.org"
label="Ace Ventura - Pet Detective">
Arts/Movies/Titles/A/Ace_Ventura_Series/Ace_Ventura_-_Pet_Detective
Dublin Core subject
dc:subject
xmlns:dc="http://purl.org/dc/elements/1.1/"
subject/text()
Required category name. Typically, the subject will be represented using keywords, key phrases, or classification codes. Recommended best practice is to use a controlled vocabulary.
humor

Update 2009-9-14: Added WordPress to the Tag Markup table and namespaces to the Tag Markup Scheme table.

PermalinkCommentsfeed media delicious technical atom youtube yahoo rss tag

Flickr: Seattle Municipal Archives

2008 Aug 25, 11:39"The Seattle Municipal Archives documents the history, development, and activities of the agencies and elected officials of the City of Seattle. Strengths of the records include those documenting engineering, parks, urban planning, the legislative process and elected officials. Holdings include over 6,000 cubic feet of textual records; 3,000 maps and drawings, 3,000 audiotapes; hundreds of hours of motion picture film; and over 1.5 million photographic images of City projects and personnel."PermalinkCommentsvia:swannman photo flickr seattle history public-domain

philosecurity - Blog Archive - Guerilla Public Service

2008 Aug 11, 3:58Fellow kindly fixes spelling error on trailer mounted electronic roadway message signs. Pulls up, connects keyboard, reads password off the side of the enclosure, etc. "Not far from my house is one of those temporary trailer-mounted variable message signs, which for the past several weeks has been advising motorists that ..." I always wondered what it would take on those signs. And if all the passwords are four characters long...PermalinkCommentssecurity hack howto sign humor

Fast hashing of variable-length text strings

2008 Jul 3, 10:12"Fast hashing of variable-length text strings", from Source Communications of the ACM archive Volume 33 , Issue 6 (June 1990) Pages: 677 - 680, Year of Publication: 1990, Author Peter K. Pearson, Lawrence Livermore National Lab, Livermore, CAPermalinkCommentshash programming acm reference

Reverse Graffiti Project

2008 Jun 18, 4:44More photos of reverse graffiti created by cleaning images onto dirty public walls.PermalinkCommentsart graffiti photos cultural-disobediance

Catalog | Stickers | Sticker #213: Orwell was Right | Microcosm Publishing

2008 Jun 9, 11:34Sticker depicting two CC camers with the text 'Orwell was Right' under.PermalinkCommentssticker orwell purchase shirt product camera privacy

Mao (game) - Wikipedia, the free encyclopedia

2008 Jun 2, 12:57A card game where 'new players are often told only "the only rule you may be told is this one."'. '...the game being a parody of life in the People's Republic of China during the Cultural Revolution, where the laws changed secretly..."PermalinkCommentscard history politics game legal parody

Flickr Api Explorer - flickr.people.getPublicPhotos

2008 Apr 3, 3:43How to get the public photos of a user via the Flickr API. Flickr's API explorer is just wonderful.PermalinkCommentsflickr api documentation reference programming xml photo

Candy Chang - Public Art

2008 Apr 1, 12:45Candy Chang has some cool public art pieces.PermalinkCommentscandy-chang art graffiti cultural-disobediance

YouTube - Urban Screens 07: Megaphone

2008 Mar 7, 10:03Big screens in public places host video games you call in and control with your cell phone: "Jury Hahn and Dan Albritton talk about their creation Megaphone - an interactive software that allows users to control Big Screen game elements with their mobilePermalinkCommentsvideo youtube megaphone software social games game videogames

Comcast Blocking: First the Internet - Now the Public (Save the Internet Blog - Blog Archive)

2008 Feb 26, 2:47"Comcast - or someone who really, really likes Comcast - evidently bused in its own crowd. These seat-warmers, were paid to fill the room, a move that kept others from taking part."PermalinkCommentscomcast article internet net-neutrality government fcc

Inhabitat - REVERSE GRAFFITI: Clean Green Street Art

2008 Jan 30, 3:00Graffiti created by cleaning your art into publicly viewable walls, signs, etc.PermalinkCommentsvia:boingboing cultural-disobediance graffiti art

volity.net | Digital Games for Analog People

2008 Jan 29, 11:55Includes an online version of Fluxx. I have my own version of Fluxx over the Internet that I had working but not pretty but this is apparently a publisher sanctioned version so there you go.PermalinkCommentsfluxx game card internet online free

Main Page - Gutenberg

2008 Jan 5, 10:39Project Gutenberg is a directory of public domain literature.PermalinkCommentsarchive books fiction database directory literature writing free gutenberg public-domain

Cory Doctorow on LIFT Videos || The presentations of the LIFT conference delivered to your desktop.

2008 Jan 2, 4:41Cory Doctorow the always entertaining and informative speaker talks on new business models, DRM, etc. FTA: "Cory Doctorow is an activist, a writer, a blogger, a public speaker, and a technology person. He speaks about "Digital Rights Management" at LIFT0PermalinkCommentsvideo cory-doctorow drm music piracy

Banksy

2007 Dec 23, 8:47Banksy's website.PermalinkCommentsart culture graffiti homepage streetart satire public politics banksy cultural-disobediance

1.8 million pages of federal case law to become freely available.

2007 Nov 15, 4:04Coming soon: case law freely available in the public domain.PermalinkCommentscopyright government information internet law legal

Guy on highway

2007 Nov 4, 11:20This weekend Sarah and I went to Tariq's house warming party in Issaquah and then to Seattle for Jon's going away party at Pike's Pub. On the drive over, just after getting through traffic on I-5 South, I saw emergency vehicles lights on the North bound side and suddenly found my lane stopped. I found out why when a man ran from the left most lane to my lane the right most, then darted left one lane and back right again. Cars started leaving my lane and I could see the man now lounging on the pavement in front of a jeep. Apparently not hurt, he got up and started walking down the highway. He didn't appear to be in his right mind and after walking by our car Sarah reported it to 911. The rest of the night went on as normal and I had fun with Jon and his friends. It'll be sad to see him go next week.PermalinkCommentsnontechnical

The Old New Thing : Nicolas Bourbaki, perhaps the biggest inside joke in mathematics

2007 Oct 15, 11:30Raymond talks about false names used in math publications.PermalinkCommentsmath humor raymond-chen blog article

311 customer service rep has a window onto San Francisco's secret heart.

2007 Oct 9, 5:12San Francisco has a free 311 number similar to 911 except not for emergencies. You describe a problem or question and they find the correct city agencies to help you. Sounds like a great interface to public political agencies.PermalinkCommentsvia:thedpshow blog article humor phone advice sanfrancisco 311 news
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