Hi Jeremy,
 

> The order does matter for filters that work as "selectors" rather than 
> strict "filters". For example, the "indexes" operator selects all the data 
> indices present in the tiddlers whose titles are in the current list.
>

In ...

http://tiddlywiki.com/#FilterOperator%3A%20indexes

What exactly is *{$:/palette}*...

[{$:/palette}indexes[]sort[title]]

interpreted as? ...being a text-reference. I presume it is translated as: take 
whatever is defined in *{$:/palette}* as a text-reference to a data-tiddler.

What would happen with a construct like this:

[[tag[foo]indexes[]sort[title]]

...assuming there were multiple data tiddlers tagged *foo*?

Also, can any field of a tiddler be used as a DataField or does it always 
have to be the *text* field? As asked / indicated here 
<https://groups.google.com/d/msg/tiddlywiki/Yv7kdCbWtNo/crA7E7xWHSsJ>, I 
think it can prove beneficial to store related data entries at the exact 
tiddler to which they relate, yet not in its text-field.

As for deleting indexes from a DataTiddler, here is one way to do it...

Saving And Loading A History Snapshot @ tb5 
<http://tb5.tiddlyspot.com/#Saving%20And%20Loading%20A%20History%20Snapshot>

Look at *\define deleteSnapshot()* and notice how the index is *set* on 
button click, however with no *setTo* value being specified. This results 
in setting an undefined value, ergo deleting the index from the data.

Best wishes, Tobias.

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