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From: John Culleton <john@wexfordpress.com>
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Subject: Re: \par in command argument
Date: Wed, 4 Sep 2002 23:42:18 -0400
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On Wednesday 04 September 2002 06:01 am, Wybo Dekker wrote:
> I'm trying to write a letter style so that I can say:
>
> \input letter.sty
> \Address{name\\street\\city}
> % ... define several other things...
> \Letter{
> Dear John,
>
> ....
>
> Love, Mary
> }
>
> But the paragraphs in \Letter's argument cause trouble:
>
> This is TeX, Version 3.14159 (Web2C 7.3.7x)
> (./t.tex
> Runaway argument?
> { ....
> ! Paragraph ended before \Letter was complete.
>
> Is there a solution to this?

I used the textmerg macro pretty much as is and had success with 
creating form letters. See my earlier correspondence under the title
"Textmerg and Context."

Hans Hagen offered workarounds for the few small problems I 
encountered.

It isn't necessary to reinvent the wheel in this case.  Textmerg.tex 
works and I suspect the ancient letterformat.tex could be made to 
work. The secret is several related macros and not one 
all-encompassing macro call. 

HTH

John Culleton