> On 30 Jan 2018, at 15:54, Wolfgang Schuster <schuster.wolfg...@gmail.com> 
> wrote:
>> […]
> 
> Use the command key which grabs the content of each column as argument (i.e. 
> your commands needs as many arguments as your table has columns):
> 
> \defineseparatedlist
>   [seplisttalk]
>   [separator={;},
>    command=\maketalk]


Thanks Wolfgang! That fixes the issues concerning the entries which are text, 
but now the filename is not understood by the command \maketalk: here is the 
modified code:

%% begin database-command.tex
\usemodule[database]

\starttext
\startbuffer[pagetalk]
        \starttabulate[|f{\bi}l|p|][before=]%
        \NC Speaker \EQ 
        \goto{{\sc 
\getvariable{talk}{speakername}}}[fig:\getvariable{talk}{speakername}]
         \NC\NR
        \NC Title   \EQ \getvariable{talk}{title}    \NC\NR
        \stoptabulate
        \startplacefigure[number=no]
                \externalfigure[\getvariable{talk}{picture}]
        \stopplacefigure
        \page
\stopbuffer

\setvariable{talk}{set}{\getbuffer[pagetalk]}

\define[3]\maketalk{%
        \setvariables[talk]%
                [speakername={#1},
                title={#2},
                picture={#3},
                ]}

\defineseparatedlist[seplisttalk]
        [separator={;},
        command=\maketalk]

\startseplisttalk
{Hacker} ; {Up to date hacking} ; {hacker.jpg}
Hacker ; Up to date hacking ; hacker.jpg
\stopseplisttalk

\stoptext
%% end database-command.tex
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