On Thursday, February 7, 2019 at 10:42:49 PM UTC-8, Mohammad wrote:
>
> As we know a variable from ouside macro should be referenced as 
> $(varname)$.
>

A variable that is defined outside a macro can be referred to within the 
macro using **either** $(varname)$ or <<varname>>, depending on context.

The difference is that occurrences of $(varname)$ are immediately replaced 
with the current value of the variable, while <<varname>> is simply 
returned unchanged as part of the macro output.  Thus these are all valid 
uses:

\define mymacro() <$somewidget param="$(currentTiddler)$" />
\define mymacro() <$somewidget param="TEXTBEFORE $(currentTiddler)$ 
TEXTAFTER" />
\define mymacro() <$somewidget param=<<currentTiddler>> />

but the following is NOT (because it mixes <<...>> inside a quoted 
parameter value where parsing doesn't occur)
\define mymacro() <$somewidget param="TEXTBEFORE <<currentTiddler>> 
TEXTAFTER" />

-e

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