Re: deferred variable lookup in environment?

[Ingo Hohmann <context@ingohohmann.de>]

On 02/02/2013 12:31 AM, Marco Patzer wrote:
> On 2013–02–02 Ingo Hohmann wrote:
>
>> I'm trying to have the date in a layer in an environment. In the
>> text using the environment, I want to be able to set the date.
>> If the date is not set, the current date should be used, otherwise
>> the set date.
>> This is what I've tried, but it is always the currentdate, that is
>> displayes.
> You are trying to use the date before it is defined. You can use a
> two-pass mechanism:
>
> \define\mydate{\datasetvariable{mydata}{date}{date}}

Thank you Marco, this works.

Is it possible to update fields in the datasetvariables table, or is it 
only possible to replace the whole table?

\setdataset[data][info][date=\currentdate]
\setdataset[data][info][subject={subject}]

After the second line, the first value is gone.


Thank you,

Ingo


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