PiggyDB

Posted by Chris Murtland
Nov 10, 2012 at 09:15 PM

Alexander Deliyannis wrote:
>Also, in a wiki, tags can be used to label pages, but they cannot be
>organised themselves—they are just part of a long flat list- so their
>contribution ends there. Piggydb allows the hierarchical organisation of
>tags, supporting conceptual development at the meta-level too. Assume
>that you are making a database of living organisms: you can have
>entities under hierarchical tags Kingdom / Phylum / Class / Order /
>Family / Genus / Species, as well as a multitude of other possible sets
>of terms.

At least in ConnectedText, categories (which are the same as tags), can be placed into a hierarchy. Any tag can be in multiple tag hierarchies. And you don’t need to know in advance what your tag hierarchies are going to be, because you can tag the tags along the way (by placing any category page into one or more other categories). Finally, you can also limit a search to items contained within a particular tag tree.

I’m not sure if there are any online, collaborative wikis that have the same functionality, though.