> Personally, my most wanted boolean operator for del.icio.us is tag union. It
> would open a load of possibilities.
Make some example, please.
Well, union would compensate for unconsistent choosing of tags. Currently there is no mechanism for ie. fetching everything _javascript_ (_javascript_, java-script, jscript, js, Ajax, DOM). If there was, you could subscribe to a whole set of tags that may exclude each other, but are related (like in the example). Moreover, you could build hierarchies, trees from known tags. Building and storing trees would not necessarily be a feature of del.icio.us, but could be client-side or hosted somewhere else and serve as an interface (adapter to del.icio.us API). Having trees would provide means to searching within an area of interest including its subbranches (everything W3C, everything _javascript_, everything concerning publications...). Searching within a brach or subscribing to it would be what one wants, especially when combined with intersections again to refine.
Maybe user groups (that are on the way) will serve as those wrappers for 'branches' as I've put it.
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