On Wednesday, June 3, 2020 at 1:16:11 PM UTC-7, amreus wrote:
>
> Just playing around with filters. Why do I get more results when using 
> [all[shadows]prefix[$:/tags]] over [all[]prefix[$:/tags]] or just simply 
> [prefix[$:/tags]] ?
>
> Are some tiddlers excluded from filters by default?  
>

The interpretation of the "all[...]" filter operator is briefly documented 
here: https://tiddlywiki.com/#all%20Operator

Take note of the following descriptions:

1) all[shadows] - all the shadow tiddlers that exist, including any that 
have been overridden with non-shadow tiddlers

and

2) As a special case, if the parameter is empty, the output is simply a 
copy of the input. This can be useful when the parameter is soft.

in case (1), the filter includes all (and only) the shadows defined by the 
TWCore (a total of 2053 tiddlers at http://tiddlywiki.com)

in case (2), the filter includes all (and only) the *non-shadow* tiddlers 
(a total of 1330 tiddlers at http://tiddlywiki.com)

Also note that when "all[]" is omitted, the default input for the filter 
run is *implied* to be all non-shadow tiddlers, thus results of 
[prefix[$:/tags]] is exactly the same as [all[]prefix[$:/tags]]

enjoy,
-e


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