This is what I wrote Jeremy some time ago and he suggested to discuss it 
here, so that anyone interested could join.

As I feel the <$list> widget as a bit awkward ;) I thought about another 
approach - which might be even more awkward. I haven't thought it through 
yet and haven't implemented anything, but would like to share the idea with 
you to see what you think.

The idea is that we have at the low level a list of tiddlers which is one 
of (all) (system) (shadows) (missing) (orphans).

Then we have some functions like
(union list list ...) and (intersection list list…)

Then we have selectors which make one of the lists properties get the 
"focus" like:
(tags list) (field fieldname list) (title list) (modified list) (creator 
list)

Then some comparators like eq, ne, lt gt, le, ge (for strings) and ==, !=, 
<, >, <=, >=
complex example:
(ne 'Stephan' (modifier (eq 'Jeremy' (creator (all))))

I have the feeling this approach could be useful, what do you think?

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