Boolean Operations on Page Listings

The possibility to combine two or more listings of pages before output in such a way as to generate a new list based on a selectable operator like

After thinking more about this: Wikka needs on one side a generic output action which accepts some content to be displayed.
{{output content="some content here" col="3"}}


As it wouldn't be convenient to manually enter content, Wikka needs some kind of database query facility (which must not be SQL). Currently, Wikka supports listings of pages according to:

Combining these elements should allow something like recent changes of a category, a list of pages that are in two or more categories, all pages linked by the homepage in alphabetical order, and so on. This means two things: Wikka must be able to retrieve different collections of pages, and Wikka must be able to sort them in different ways before the result will be displayed.

to be continued
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