In order to work on something real, let me replace your *A* tag by *task*:
then {{{ [tag[task]] }}} in any tiddler of tiddlywiki.com produces the
list:

 Compose ballad <http://tiddlywiki.com/#Compose%20ballad>
 Get the Ring <http://tiddlywiki.com/#Get%20the%20Ring>
 Go to Mordor <http://tiddlywiki.com/#Go%20to%20Mordor>
 Kill the Dragon <http://tiddlywiki.com/#Kill%20the%20Dragon>
 Make the beds <http://tiddlywiki.com/#Make%20the%20beds>

While {{{ [field:tags[task]] }}} produces:

Compose ballad <http://tiddlywiki.com/#Compose%20ballad>
Get the Ring <http://tiddlywiki.com/#Get%20the%20Ring>
Kill the Dragon <http://tiddlywiki.com/#Kill%20the%20Dragon>
Make the beds <http://tiddlywiki.com/#Make%20the%20beds>

Note that Go to Mordor <http://tiddlywiki.com/#Go%20to%20Mordor> disappears
because it has an additional *done* tag, while the others only have the
*task* one.

So if none is what you expect, what list would you want a filter (or
combination of filters) to produce?

X.


-- Xavier Cazin


On Sat, Jun 28, 2014 at 7:28 PM, Jon <[email protected]> wrote:

> So, {{{ [field:tags[A]] }}} doesn't work
>
>
> On Saturday, 28 June 2014 18:02:28 UTC+1, Jon wrote:
>>
>> Hi Xavier,
>>
>> Yes, I clicked on the i button and I see what you mean.
>>
>> I've played around with Stephan's suggestion, but I just don't know
>> enough to make it work.
>>
>> This is what I have at the moment {{{ [tag[A]] }}} which is pasted into a
>> tiddler. Could you please adapt this to include Stephan's suggestion?
>>
>> Thanks, Jon
>>
>>
>>
>> On Saturday, 28 June 2014 17:50:02 UTC+1, Xavier wrote:
>>>
>>>
>>> Would this mean I would need to enter a field value of "A" into each
>>>> tiddler I wanted to filter? If so, that wouldn't be practical either. I
>>>> just want to filter on the actual tag.
>>>>
>>>
>>> No, Stephan's solution just works because the tags of a tiddler are
>>> actually contained in a field that is called *tags*. You can check that
>>> by clicking on the i button next to the tiddler title and then choose the
>>> tab *fields*.
>>>
>>> Xavier.
>>>
>>> It's simply this - to filter tiddlers that only have a single tag eg.
>>>>> "A" and only using that tag in the filter (rather than not "B", "C", "D"
>>>>> etc.)
>>>>>
>>>>
>>>> I think Stephan already described the syntax for this....
>>>> [field:tags[A]]
>>>> which selects all tiddlers whose 'tags' field has a value of "A"
>>>>
>>>> Note that this is different from writing
>>>> [tag[A]]
>>>> which selects all tiddlers whose 'tags' field *contains* a value of "A"
>>>> (along with possibly other tag values)
>>>>
>>>> enjoy,
>>>> -e
>>>> Eric Shulman
>>>> TiddlyTools / ELS Design Studios
>>>>
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