Posts Tagged ‘hashtags’

Triple tags on Twitter

July 4, 2008

Triple tags (known as Machine Tags on Flickr) are a way of tagging web content with tags having three parts: a namespace, a predicate and a value. This means that we can differentiate between content about a (tagged taxonomy:vernacular=beagle) and (tagged maritime:vessel=beagle). Of course, that relies on everyone using the same tagging schema (my two examples could also be tagged with, say, pet:dog=beagle and history:ship=beagle). Fortunately, communities of web authors are agreeing on such schema.

One schema that is widely used is for geo- (or location-) tagging, where posts such as my picture of a Kingfisher on Flickr are tagged with (in that case):

  • geo:lat=-1.56403
  • geo:lon=53.60913

In other words, the coordinates of the place where I took the picture (pages using that schema are also often tagged with ““).

Kingfisher at Bretton Lakes, South Yorkshire

It is then possible for Flickr to display that picture overlaid on a map of the location.

The Flickr page is also tagged:

taxonomy:binomial=Alcedo_atthis
taxonomy:genus=Alcedo

which gives the scientific name (binomial or binominal) of the Common Kingfisher, Alcedo atthis, including the Genus, Alcedo.

Another form of tagging, using hash tags, is used by the social media text-messaging service Twitter. Tags in twitter are prefixed with a hash symbol (#), hence the name. A “hash-tagged” message might look like:

I live in #England

Hash tags are parsed by three sites that I know of (there may be others — if so, please let me know): Hashtags (e.g. ), Summize (Summize for “#blog”) and Twemes ().

All well and good.

It occurred to me recently that it should be possible to use Triple tags in Twitter messages, so I posted these “tweets” as they’re called (I find that rather, er, twee):

#tagged post about #Kingfisher #taxonomy
( #taxonomy:genus=Alcedo,
#taxonomy:binomial=Alcedo_atthis )

(See
http://twitter.com/pigsonthewing/statuses/849630924)

and:

Is anyone is parsing #geotagged posts like this: #geo:lat=52.478342 #geo:lon=-1.895389 ( #birminghamuk #rotunda #geo #geotag #tripletag)

(See
http://twitter.com/pigsonthewing/statuses/853592240)

(line breaks have been inserted to improve readability)

Disappointingly, none of the three hash tag parsers above managed to understand these. They all see “#geo:lat=52.478342” as just “#geo” and “#taxonomy:binomial=Alcedo_atthis” as just “#taxonomy”.

Worse still, Hashtags wrongly displays my two posts without the second two-thirds of the tag content, as:

#tagged post about #Kingfisher #taxonomy ( #taxonomy #taxonomy )

(see http://hashtags.org/tag/taxonomy/)

and:

Also wonder if anyone is parsing #geotagged posts like this: #geo #geo ( #birminghamuk #rotunda #geo #geotag)

(see http://hashtags.org/tag/taxonomy/).


See also:

Wouldn’t it be great if services which parse hash tags in Twitter messages also recognised “hash-triple-tags”?

[Update: Summize was bought by Twitter and is now absorbed by them as Twitter’s own search.]

[Update: Hashtags.org now parses the triple tags as, for example, just “#taxonomy”]

[Update: David Carrington of Dabr tells me that some of these triple tags are too long for Twitter’s search API. I’ll try to find out what the limit is, and raise the matter with Twitter’s support people]

[Update: There is now a tool to automatically generate tags for Flickr images of living things; iNaturalist tagger.]

Suggested method of publishing microformats in Twitter posts

January 5, 2008

Twitter posts like this one:

We’re still deep in the Sundarbans, near Tambulbunia, meeting experts on dolphins and tigers. l:Tambulbunia, Bangladesh=22.27722,89.71905

have a place- name and corresponding coordinates (indicated by the prefix “l:”). This has allowed them to be plotted on a map.

It should be possible for the poster to send, say:

We’re still deep in the Sundarbans, near Tambulbunia, meeting experts on dolphins and tigers. #hcard: fn+locality:Tambulbunia: country-name:Bangladesh: geo:22.27722,89.71905

using colons as delimiters and have Twitter render that comment marked up as an hCard.

In the short term, this could be achieved by a third-party site, like #hashtags .

UPDATE:  being more mindful of the 140 character limit than I have in the above example, perhaps class names might be abbreviated (“loc” for “locality”, “ctry” for “country-name”, and so on).