Thanks S. S. That does juts what I wanted. I'll call that success.

Regards,
David.

On Thursday, 28 February 2019 11:02:47 UTC+9:30, S. S. wrote:
>
> This seems to work for me.
>
> \define variable-test(var)
> <$list filter="[[$var$]] +[is[variable]]" emptyMessage="''$var$'' - 
> Undefined variable or macro">
> </$list>
> \end
>
> 1. <<variable-test list-links>>
>
> 2. <<variable-test list-linkss>>
>
> It uses a single line return with nothing else in the *results area* 
> before the closing tag </$list>  to give an empty looking result. I don't 
> know if this is an undocumented feature, or if it's a bug that will be 
> fixed at some point causing this macro to break down. If that bothers you, 
> just use an unused macro such as <<emptyMessage>> in the *result area*.
>>
>>

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