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Boolean logic is quite a simple filter, it doesn't allow complex ones as in my first example.
Given
Book1,Author1,tag1
Book2,Author1,no tags
Book3,Author2,tag1
Book4,Author3,no tags
My query, using tag1 as the main search term, would pull out books 1, 2 & 3. With the current search/filter system I would have to filter on tag1, make a list of all the authors it returned, then clear the filter and re-filter on the complete list of authors.
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