FWIW, to me it appears like the listed operator cannot be re-used in the 
run for some reason, even on a different parameter or different field.  Yet 
by itself just once, combined with tag does work.  I made my.field and 
my.field2 with combinations of A, B, C and X, Y, Z respectively and put 
alpha, beta, gamma in tags, and combining tag operator with listed works 
fine.  And tag filter intersection seems to work as 
expected: [tag[alpha]tag[gamma]]

Perhaps the clunky original plan of prefixing tags for the possible values 
of each field may have to be what I resort to.  e.g. [tag[name-some 
name]tag[structure-some structure]tag[context-some context]]



On Sunday, September 27, 2020 at 6:50:46 PM UTC-5 Cade Roux wrote:

> I see what you are saying, but I thought it was starting with a default 
> [all[]] operator.  I even tried putting an explicit [all[]] operator on the 
> front.
>
> Thanks,
>
> Cade
>
> On Saturday, September 26, 2020 at 11:37:23 AM UTC-5 [email protected] 
> wrote:
>
>> Hi Cade,
>>
>> you are understanding the mathematical "idea" of intersection correct BUT 
>> you are telling TW to throw away everyting that your first run outputted 
>> when you are using filter-operators that throw away the input (stated as 
>> "input ignored" in the filter operator) in subsequent runs, as *[A]* and 
>> *[C]* do. See also: https://tiddlywiki.com/#title%20Operator.
>>
>> What you actually get is everything that lists *C* in your first <$list> 
>> and *A* in your second.
>>
>> Regards,
>> Mirko
>>
>> Am Samstag, 26. September 2020 17:56:02 UTC+2 schrieb Cade Roux:
>>>
>>> Thanks, I have started using a field and I am struggling with list 
>>> intersections, i.e. lists of items that are tagged both A and C:
>>>
>>> I thought these would be the intersection and should be equivalent:
>>>
>>> <$list filter="[[A]listed[my.field]] +[[C]listed[my.field]]" />
>>> <$list filter="[[C]listed[my.field]] +[[A]listed[my.field]]" />
>>>
>>> But not only are they not equivalent, they are not correct lists:
>>>
>>> [image: Screenshot 2020-09-26 105510.png]
>>>
>>> What am I not understanding correctly about the filter intersections?
>>>
>>> Thanks,
>>>
>>> Cade
>>>
>>> On Saturday, September 26, 2020 at 1:03:00 AM UTC-5 TW Tones wrote:
>>>
>>>> Cade,
>>>>
>>>> As far as I know Gentags is the state of the art for a plugin giving 
>>>> you alternative tag fields. 
>>>>
>>>> Just keep in mind tags are a solution built into the core. 
>>>>
>>>>    - I for one avoid them to keep them free for ad hoc tagging. 
>>>>    - Instead I tend to use my own fields and list fields that in many 
>>>>    ways work not unlike tags if you want them to.
>>>>       - See listops and other operators and widgets.
>>>>    - Avoid the use of prefixes on titles, including tag names where 
>>>>    practical otherwise you will find you need to parse the title to 
>>>> extract 
>>>>    info.
>>>>
>>>>
>>>> For a small or for purpose wiki do what you want with the tags and 
>>>> prefixed titles, its only when you transfer tiddlers or grow wikis it may 
>>>> become a problem.
>>>>
>>>> Regards
>>>> Tony
>>>>
>>>> On Saturday, 26 September 2020 04:48:59 UTC+10, Cade Roux wrote:
>>>>>
>>>>> I find myself looking to use this concept in my data mart data 
>>>>> dictionary/user manual, as I want to have three types of tags for one set 
>>>>> of generated tiddlers and three types of tags for another set of 
>>>>> generated 
>>>>> tiddlers and putting a prefix on each set and throwing them into tags 
>>>>> field 
>>>>> is kind of unwieldy and the filters will be really awkward.
>>>>>
>>>>> Is https://ooktech.com/jed/ExampleWikis/GenericTagFields/ this the 
>>>>> latest thinking on that or is there another plugin I should be looking at 
>>>>> (or something that has made it to core?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Cade
>>>>>
>>>>

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