Hi Jeremy,

Thanks for the answer ; its a very valuable information. I'm also sorry for 
having asked as I've just discovered it's already in the doc (last 
paragraph of "TiddlerFilters" tiddler) ...

Maybe it deserves to be emphasized !

FrD

Le jeudi 24 avril 2014 12:57:50 UTC+2, Jeremy Ruston a écrit :
>
> Hi FrD
>
> A run of filter operations starts out with the current list set to all the 
> available tiddlers (both system and non-system, but excluding shadows). 
> It's as if `[all[tiddlers]]` were prepended to every run of filter 
> operations.
>
> So, `[tagging[]]` is equivalent to `[all[tiddlers]tagging[]]` meaning: get 
> a list of all the tiddlers and then replace it with a list of all the 
> tiddlers tagged by any of those tiddlers. You'll end up with a list of all 
> the tiddlers that have at least one tag.
>
> Best wishes
>
> Jeremy.
>
>
>
>
> 

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