Bimlas,

I am not 100% clear on what you detailed issue is here however I have to 
disagree with 

Just realized that it's simply impossible to use the same "epxression" 
> (tag) to describe different things.
>
> I believe you can use tiddlywiki tags, tiddlers and fields to represent 
any relationship in the universe, yes I am that bold to make that claim, 
and I am happy for someone to present cases they think I cant and prove, 
and demonstrate they are incorrect. However I think you may be trying to 
use the TOC macro incorrectly, and you need to make your own listing method.

If we look at https://imgur.com/VI2lr4s all you need is three tags string 
ruby and python
and if you test for ruby AND string you will get your ruby/string

Now if your use of "string" means the one on ruby is totally unrelated to 
the string you tag on python then divide it into two tags. In your case 
this does not seem required.

The thing is the TOC macros are helpful to have as they do a recursive 
process that drills down a hierarchy an indefinite number of levels. I 
believe every one should learn how to code something that is recursive and 
what it means, just as they should understand sequence, iteration and 
selection (yes I mean everyone). But why try and make a TOC process do 
something it is not customised for?, the ones in tiddlywiki are to list the 
tiddlers tagging a tiddlers children grand children all the way down, you 
are not asking for that here, you are asking for some logic within that.

Until I understand better lets look at a more complex test I have designed 
previously in TWC but see no issue doing it in TW5, it demonstrates how 
sophisticated you can get.

   - It is possible to look at all tags on a given tiddler, and for each of 
   these tags test if they are in turn tagged by another tiddler
   - For Example lets say my 1st tiddler is tagged
   Working Projectname subtask
   - and for arguments sake we also have a tiddler called status which tags 
   the tiddlers 
   new working hold and finished
   - It is possible to test each of the tiddlers current tags "Working 
   Projectname subtask" to see if any of them are tagged status (as working is)
   
Personally I have started using custom fields, their existence in a tiddler 
and when necessary their value in a tiddler for my organisational methods, 
leaving tags free for adhoc relationships and the default TOC use.

You can also test if a tiddler is NOT tagged something.

I think the http://tagfilter.tiddlyspot.com/ 
<http://www.google.com/url?q=http%3A%2F%2Ftagfilter.tiddlyspot.com%2F&sa=D&sntz=1&usg=AFQjCNE68P1V3hjC_biJfBC3HYxqs5WCmQ>
 was 
proposed for TW5.1.7 and alternatives now exist in TW5.1.17 and sometime 
before.

Feel free to ask more questions, ideally keeping them simple, a step at a 
time. or provide a working example.

Regards
Tony

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