The reality of it is practically nobody uses even intersections. Adding generic set calculus would likely greatly degrade performance.

On the otherhand, unions (as discussed) are probably likely.

Larson, Timothy E. wrote:
Mislav wrote:
  
In addition, a hypen character can't be an operator ("yahoo-software")
because tons of people are using it for phrases ("e-book programming
to-read").  
    

That's not the end of the world.  You'd have to convert them all to
underscores, or camelCased, or something, and email the users of the
change "to improve the functionality and user experience of
del.icio.us".  

  
Personally, my most wanted boolean operator for del.icio.us is tag
union. It would open a load of possibilities. 
    

The greater variety of set operations, the better.  Delicious can only
benefit from it, IMO.

Tim

  
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