On Sunday, December 31, 2017 at 11:58:15 PM UTC-8, Mal wrote:
>
> Just to get this clear in my mind:
>
> You indicated that the square brackets in filter expressions contain 
> literal values.  How does this relate to the "is[current]" term?  Would you 
> consider the tiddler category "current" is a literal?
>

All the category operands for the is[...] filter are literal keywords that 
must be written exactly as specified in
   https://tiddlywiki.com/#is%20Operator

current is the current tiddler
image has an image ContentType
missing does not exist (other than possibly as a shadow tiddler), 
regardless of whether there are any links to it
orphan has no hard links to it
shadow is a shadow tiddler, regardless of whether it has been overridden 
with a non-shadow tiddler
system is a system tiddler, i.e. its title starts with $:/
tag    is in use as a tag
tiddler exists as a non-shadow tiddler

Note that the "is" filter CAN accept TextReferences, using curly braces... 
or variable values using the angle brackets.  Thus:

<<list-links "[is{!!filterfield}]">>
or
<$vars filtervar={{!!filterfield}}">
<<list-links "[is<filtertype>]">>
</$vars>
where "filterfield" is a field in the current tiddler whose value is one of 
the above listed literal keywords.

-e


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