Thank you both. What I conclude from this is that I need to learn (quite a 
bit) more about TiddlyWiki — and then all of this will become clear to me.
On Monday, 1 February 2021 at 11:42:33 UTC-5 [email protected] wrote:

> Can still be done.  A bit complicated to build that kind of filtering 
> smarts, but I think that would be a really fun project to work on for 
> somebody who has the time.
>
> If the result is a simple count of tiddlers for each individual tag, and a 
> simple count of tiddlers for each possible value in a field (that done for 
> each field), that would be easier than getting counts for each possible 
> combination of tags + each possible combination of field values.
>
> And the process does not need to be told what tags exist, what fields 
> exist, nor what field values exist.  The process can figure each of those 
> out automagically, with maybe just a hard-coded "exclude" list if there are 
> certain kinds of tags, and/or fields, and/or field values that should be 
> excluded from the process.
>
> On Monday, February 1, 2021 at 12:08:15 PM UTC-4 [email protected] wrote:
>
>> Thank you, Charlie. But, alas, no.
>> I would like to select, say, m people from a TiddlyWiki (somehow) then 
>> have the TiddlyWiki tell me what common features these people have. 
>>
>> On Monday, 1 February 2021 at 10:23:54 UTC-5 [email protected] wrote:
>>
>>> Say you are interested in the collection of people who are librarians, 
>>> and you want all of these librarians grouped by those 
>>> features/characteristics.
>>>
>>> Do you want the results to look like:
>>>
>>>    - 10 librarians were born in 1965, and favourite author is Margaret 
>>>    Atwood
>>>    - 2 librarians were born in 1970, and favourite author is J.R. 
>>>    Tolkien
>>>    - 5 librarians were born in 1971, and favourite author is Margaret 
>>>    Atwood
>>>    - 7 librarians were born in 1971, and favourite author is J.R. 
>>>    Tolkien
>>>    - 3 librarians were born in 1982, and favourite author is Agatha 
>>>    Christie
>>>    - ....
>>>
>>> If so, that can certainly be done.
>>>
>>>
>>> On Monday, February 1, 2021 at 10:35:49 AM UTC-4 [email protected] 
>>> wrote:
>>>
>>>> Suppose that the Tiddlers represent individual people, and that within 
>>>> each of these Tiddlers there are facts about those people that they have 
>>>> in 
>>>> common. The facts could be represented in any way available in TiddlyWiki. 
>>>> For instance, a fact might be a person's occupation or birth year or 
>>>> favourite author.
>>>>
>>>> On Sunday, 31 January 2021 at 21:10:48 UTC-5 [email protected] wrote:
>>>>
>>>>> Although I say ABSOLUTELY (!!!), what I have in mind involves a horrid 
>>>>> mess of filters in a process that needs to know each and every 
>>>>> feature/characteristic to consider.
>>>>>
>>>>> It ain't pretty if features/characteristics are few and simple, and it 
>>>>> is downright ugly otherwise.
>>>>>
>>>>>
>>>>>
>>>>> On Sunday, January 31, 2021 at 4:19:02 PM UTC-4 [email protected] 
>>>>> wrote:
>>>>>
>>>>>> Can I identify a collection of Tiddlers within a wiki and have 
>>>>>> TiddlyWiki tell me which features or characteristics are shared by those 
>>>>>> Tiddlers?
>>>>>
>>>>>

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