[NTG-context] beta (processaction & "|")

[Peter Rolf]

Hans Hagen wrote:
> Peter Rolf wrote:
>> Hans Hagen wrote:
>>   
>>> Peter Rolf wrote:
>>>     
>>>> \processaction[\FOO][
>>>>   |=>,
>>>>   unknown=>]
>>>>   
>>>>       
>>> hm, | and ~ are always special, put \string in fron tof it, or use \letterbar and \lettertilde 
>>>
>>>     
>> hm, same error if I use \string| or \letterbar
>>   
> do you have a minimal tes file?
> 
> a solution may be
> 
> \let\savedbarcommand=|
> 
> \unexpanded\def|{\savedbarcommand}
>
Yes, this works.

I've tried to create a minimal example, but in the end all points to the
fact, that "|" is a special character. So even the use of "|" as
argument of some macro like

 \FOO[data={||abcx}]{..}

is not recommended (without prior catcode change). I use the symbols as
an abbreviation for different MP graphics, and it wouldn't make sense to
write \letterbar every time. Looks like I have to choose a different symbol.

Greetings, Peter

>  
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