Hi,
What is "this", i.e. where's your problem?
How to format the title page? -- You could use a table.
Of course but my question is in fact: Is it better to use a ConTeXt table or TeX primitives for a title page ?
Do you need the "jobs" multilingual? -- use \translate[fr=Président, de=Präsident, en=President]
I don't...
How to define a macro? -- \def\President#1{\def\doPresident{#1}} (and use \doPresident in the table) The letter style uses a similar approach; I'm just trying to enhance it, see the "serial definition" thread.
I don't think the "\Something = {Anything}" style is possible at all. You could use keyval style like \MyTitle[president={M. Prénom NOM}, somebodyelse={}], see http://wiki.contextgarden.net/ Commands_with_KeyVal_arguments I don't know how that could work with lists of persons.
Ok, I'll try. Thanks.