Thanks Mark S. 

That is helpful. It need to absorb it and play a bit to really "get" it. 
The missing piece for me is still I can't quite grasp what "level" I'm at 
in each thing. The "bracketing thing" in TW seems unusual. Morphing syntax? 
I get confused because it almost behaves as if it were* part *of the "code", 
not just a convention for containing it.

I'm trying to take your notes and put them in a table such that the 
different combos begin to make logical sense. I'm not quite there yet. Give 
me a couple of months.

My emphasis below.

Mark S. wrote:
>
> The following is mostly true:
>
> Inside of filter runs, use single <>,[],{}. The qualification is that the 
> entire 
> filter run has a real or implied set of square brackets:
>
>     filter="Josiah David Mark" -- each name has an implied double bracket. 
> So the same as
>
>     filter="[[Josiah]] [[David]] [[Mark]]"
>
> But if I Josiah, David, and Mark (a popular 1960s folk music group, I 
> think) were names of variables, then the filter could look like:
>
>     filter="[<Josiah>] [<David>] [<Mark>]"
>
> But, outside of a filter run AND outside of a macro,  macros/variables 
> need double <<>> :
>
>     <<Josiah>> <<David>> & <<Mark>> lived by the sea ... 
>
> Inside of a macro, you can refer to macros with double brackets:
>
> \define dragonpuff()
>     <<Josiah>> <<David>> & <<Mark>> lived by the sea ... 
>
> or with variable placeholder notation :
>
> \define dragonpuff()
>     $(Josiah)$ $(David)$ & $(Mark)$ in the land of Sara-lee ... 
>
> Just to make things interesting, there is a new notation using double 
> angle brackets for arguments inside of macros:
>
> \define dragonlyric(item1 item2)
>     And brought him <<__item1__>> and <<__item2__>> with a might puff!
>  
>

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