>
>
> We can already use the set widget to store an intermediate filter result. 
> With a new filter operator to retrieve a list from a variable we could do 
> this:
>
> <$set name="partial-result" filter="[all[shadows+tiddlers]!has[draft.of]">
> <$list filter="[varlist[partial-result]tag[Foo]] 
> [varlist[partial-result]tag[Bar]]">
> ...
> etc
>

What is that varlist operator? I can't see any reference on tw 
documentation.
 

>
> I think that is quite powerful, but it doesn't really help with an 
> expressive way of writing an OR relationship.
>
> No, there is not such way. And I think most people would like to have one

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