rel-tag-spaces

This is a list of "name spaces" suitable for use in tagging, and by the rel-tag microformat. Please feel free to add to it, in alphabetical order.

A9

• One word - http://a9.com/microformats
• Multi-word - http://a9.com/source+code (plus sign)

Amazon.com

• One word - http://www.amazon.com/tag/horror
• Multi-word - http://www.amazon.com/tag/science%20fiction (%20, browsers will auto-encode a space into this)

(note - not valid for amazon.co.uk)

del.icio.us

• One word - http://del.icio.us/tag/dog
• Multi-word - http://del.icio.us/tag/german_shepherd (underscore)

Discogs

(for musical artists)

• One word - http://www.discogs.com/artist/Genesis
• Multi-word - http://www.discogs.com/artist/Jimi+Hendrix (plus sign)

eBay

• One word - http://search.ebay.com/door
• Multi-word - http://search.ebay.com/door-mat (hyphen)
• International - http://search.ebay.co.uk/door (etc.)

Flickr

• One word - http://www.flickr.com/photos/tags/key
• Multi-word. Flickr allows all of the following, and treats them as "keyhole":
  • http://www.flickr.com/photos/tags/key_hole (underscore)
  • http://www.flickr.com/photos/tags/key-hole (hyphen)
  • http://www.flickr.com/photos/tags/key+hole (plus)
  • http://www.flickr.com/photos/tags/key=hole (equals)
  • http://www.flickr.com/photos/tags/key*hole (asterisk)
  • http://www.flickr.com/photos/tags/key.hole (stop)

More on this "tag-cleaning" behavior and Flickr's note on tag-cleaning.

HashTags

Tags for Twitter posts, but also suitable as a general target for tagged links:

• One word - http://hashtags.org/tag/microformats/
• Multi-word - tbc

ISBN

For ISBN codes, e.g. 0-9507881-2-0:

• Talis (note: no hyphens)
  • ISBN-10 - http://cenote.talis.com/isbn/0950788120
  • ISBN-13 - http://cenote.talis.com/isbn/9780950788128
• Wikipedia
  • ISBN-10 - http://en.wikipedia.org/wiki/Special:Booksources/0950788120 or http://en.wikipedia.org/wiki/Special:Booksources/0-9507881-2-0
  • ISBN-13 - http://en.wikipedia.org/wiki/Special:Booksources/9780950788128 or http://en.wikipedia.org/wiki/Special:Booksources/978-09507881-2-8
• WorldCat
  • ISBN-10 - http://worldcat.org/isbn/0950788120 or http://worldcat.org/isbn/0-9507881-2-0
  • ISBN-13 - http://worldcat.org/isbn/9780950788128 or http://worldcat.org/isbn/978-0950788128

ISSN

For ISSN codes, e.g. 0007-0335

• WorldCat - http://worldcat.org/issn/0007-0335 (hyphen mandatory)

Journa-list

• One word - http://www.journa-list.com/tags/letters
• Multi-word - http://www.journa-list.com/tags/royal+mail (plus sign)

Technorati

• One word - http://technorati.com/tag/cheese
• Multi-word - http://technorati.com/tag/apple+pie (plus sign)

Wikipedia

• One word - http://en.wikipedia.org/wiki/sugar
• Multi-word - http://en.wikipedia.org/wiki/brown_sugar (underscore)

Issues (Wikipedia)

• Case sensitivity (http://en.wikipedia.org/wiki/Perry_Barr works; http://en.wikipedia.org/wiki/perry_barr does not)
• Caution should be exercised when using Wikipedia as a name-space. For example, an article about Birmingham, Alabama, tagged with a link to http://en.wikipedia.org/wiki/Birmingham would link to an article about Birmingham, England.

Wikitravel

For place names.

• One word - http://wikitravel.org/en/London
• Multi-word - http://wikitravel.org/en/East_Grinstead (underscore)

Issues (Wikitravel)

• A tag using, e.g. http://wikitravel.org/en/Newcastle will link to a disambiguation page.

Yedda

For Questions & Answers:

• One word - http://yedda.com/questions/tags/technology
• Multi-word - http://yedda.com/questions/tags/home+improvement (plus sign)

For people (by interest):

• One word - http://yedda.com/questions/tags/technology
• Multi-word - http://yedda.com/people/tags/web+2.0 (plus sign)

Related pages

• rel-tag
• rel-tag-faq
  • See also rel-faq
• rel-tag advocacy - encourage others to use rel-tag.
• rel-tag-spaces - sites suitable as using as targets for rel-tag links.

The rel-tag specification is a work in progress. As additional aspects are discussed, understood, and written, they will be added. These thoughts, issues, and questions are kept in separate pages.

• rel-tag-feedback - general feedback (as opposed to specific issues).
• rel-tag-issues - specific issues with the specification.
• rel-tag-other-evidence - tagging schemas other than those used in rel-tag