For simple lists that works. I needed a more robust solution and solved the
problem with the following code: -simplified
\define displayAuthor(tiddlerName)
<!-- This macro (for demo purposes) displays the author's name in a
list. You can use the variable tiddlerName for any purpose -->
<li>$tiddlerName$</li>
\end
\define runMacroOnFilterIntersection(filter1, filter2, macroName)
<!-- This macro runs a passed macro once per value that exists in both
filter1 and filter2 -->
<$list filter="$filter1$" variable="filter1">
<!-- Now that we have one item from filter1 (in the variable
filter1), lets compare it to filter2 -->
<$list filter="$filter2$" variable="filter2">
<!-- We now have the first item in filter2 (In the variable
filter2) run the macro only if the two values filter1 == filter2 -->
<$reveal default=<<filter1>> type="match" text=<<filter2>> >
$macroName$
</$reveal>
</$list>
</$list>
\end
<!-- Example of a set of complex filter calls -->
<$macrocall $name="runMacroOnFilterIntersection"
filter2="[list[!!authors]]"
filter1="[field:title[$:/data/authors]indexes[]removeprefix[alt:]]"
macroName="<$macrocall $name='displayAuthor'
tiddlerName=<<filter2>> />"
/>
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