Flickr has a definite relationship amongst tags called "clusters", and they seem to be deduced. For instance, for the tag "wasp" you can see clusters of wasp pictures:

        http://www.flickr.com/photos/tags/wasp/clusters

and they relate other tags like insect, macro, bug, nature, bee, flower, etc. This may be done by observing other tags that are also used in association with "wasp", and perhaps we don't have sufficiently large sample size in Chandler. :-/

However, I much prefer "clusters" to any hard hierarchy. Part of the charm of tags is their fluidity and free form.

Reid

On Jul 28, 2006, at 19:11, Philippe Bossut wrote:
Hi there,

There's an interesting thread on sharing going on @cosmo-dev. On one of the message, Morgen wrote: - Tags need to be hierarchical, and when examining an item's Tags for their ACLs, super-Tags must also be examined.

My gut reaction to hierarchical tag is "no way": hierarchies have plenty of usability issues (to create, maintain, modify, etc...). The success of the informal "folksonomies" using tags only is a tribute to the idea that non-hierarchical tags are easier to manage. *But*, saying that there is no spelled out hierarchies between the tags does not mean that there is no structure between them. Such a structure will need to be deduced through how the tagged items relate to each other. Segmentation techniques should be able to infer a local hierarchy of tags even in the most tangled set. Once the local hierarchy is deduced (and appropriately displayed), one can imagine to turn "off" a whole node ("work" in the example given by Bobby).

Of course, this is rather advanced analysis of our soup of data living in the repository but I think that some of the things that Xun is planning to do would be perfectly applicable here (his unsupervised tagging in particular).

Xun, what do you think?

Cheers,
- Philippe
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