Am 16.06.2012 um 14:11 schrieb Meer, H. van der:
> In order to be able to use attributes on xml-nodes freely, the following
> situations can arise:
>
> The foregroundcolor parameter gets a value:
> <node color="red"> correctly sets ..[foregroundcolor=\xmlatt{#1}{color}]
> color to red.
>
> However, in the next case the current foregroundcolor should be left as is,
> but reverts to black:
> <node> ..[foregroundcolor=] and is apparently reset to the general default.
When you write “foregroundcolor=” you apply *nothing* to the key and the last
setting is changed.
> trying the following seemed the solution, but it does not work:
> ..[\doifnot{\xmlatt{#1}{color}}{\empty}{foregroundcolor=\xmlatt{#1}{color}}]
> giving in the log:
> {foregroundcolor=orange}' in line 16 (249>:)
> check > missing or ungrouped '=' after '\doifnot {}{}
>
> Putting the above \doif inside an \expanded{} does not alter the behaviour.
>
> How to accomplish leaving the parameter as is for an absent attribute?
You can try
“\expdoifnot{\xmlatt{#1}{color}}{}{backgroundcolor=\xmlatt{#1}{color}}”
but I can’t say for sure without a example.
Wolfgang
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