On 16 jun. 2012, at 15:18, Wolfgang Schuster wrote:

You can try “\expdoifnot{\xmlatt{#1}{color}}{}{backgroundcolor=\xmlatt{#1}{color}}”
but I can’t say for sure without a example.

I tried that, but it makes no difference and the color does not appear:

mkiv-base.map} (virtual://buffer.embedded_x_table.1

check           > missing or ungrouped '=' after 'foregroundcolor=orange'