Maybe there is a workaround for this, but what would be really handy (for me at least) is to have the “is not” operator available in the tags section of smartgroups.
For instance i dug thru my images database and tagged all pictures with interesting skies with a tag sky. This database is huge so i might have missed a lot. So if i could make a smartgroup that selects for all images which are not tagged sky i could easily find those not tagged yet. Of course this would also work brilliant with pieces of text or whatever you are trying to sub organise.
Perhaps another common example, I use tags to categorize my tasks. Status could be any of four different states: Not Started, In Progress, Waiting on Someone, Complete.
Obviously when I want to view my tasks, I want to see the ones that are not tagged complete.
Another use that I imagine is common: I store hundreds of .pdf files of journal articles in folders (that are now tags). They are organized in a few slices: method, region, and main topics. I would love an easy way to make a smart folder that had all articles on “war” but not “Europe” or all articles that are on Africa but don’t make use of formal models.
A lot of academics seem to use DTP, so I’m guessing a lot of people have similar requests.