Am 27.03.10 17:56, schrieb Wolfgang Werners-Lucchini:
I do not understand the the main principle.
You're mixing different things.
What is the difference between
\setupletterstyle[option][backaddress=yes]
In t-letter.tex you can fint this:
\startsetups[\v!letter:\v!layer]
\doif\@@@@lsoptionmarking
\v!yes{\directsetup{\v!letter:\v!place:\v!foldmark }}
\doif\@@@@lsoptionbackaddress\v!yes{\directsetup{\v!letter:\v!place:\v!backaddress}}
\doif\@@@@lsoptionaddress
\v!yes{\directsetup{\v!letter:\v!place:\v!address }}
\doif\@@@@lsoptionreference
\v!yes{\directsetup{\v!letter:\v!place:\v!reference }}
\doif\@@@@lsoptionlocation
\v!yes{\directsetup{\v!letter:\v!place:\v!location }}
\doif\@@@@lsoptionlettermain
\v!yes{\directsetup{\v!letter:\v!place:\v!lettermain }}
\doif\@@@@lsoptionletternext
\v!yes{\directsetup{\v!letter:\v!place:\v!letternext }}
\stopsetups
With \setupletterstyle[<element>=yes|no] you can show or hide elements
(like the foldmarks or the backaddress) in the output.
\setupletterstyle[backaddress][alternative=yes]
In 'default.nli' I found
\defineletterelement[\v!backaddress][\v!auto]
{\doifelselettervalue\c!backaddress
{\lettervalue\c!backaddress}
{\lettervalue\c!fromname
\doiflettervalue\c!fromaddress\\
\lettervalue\c!fromaddress}}
what I interpret in the following way:
If 'backaddress'=auto
If exist a constant 'backaddress'
use it
else
compose one from 'fromname' and 'fromaddress'
The constant needs a content, if there is no content for 'backadress'
the field is filled with 'fromname' and 'fromaddress'.
\defineletterelements creates a macro, where the first argument is
the name of the elements and the second a name for the alternative,
e.g. \defineletterelement[<element>][<alternative>]{definition}
You can use the created element with
\setupletterstyle[<element>][alternative=<alterntive>],
in your case \setupletterstyle[backaddress][alternative=auto]
When you don't like this mechanism you can use the internal
element setups itself with
\startsetups letter:backaddress
...
\stopsetups
Wolfgang
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