[NTG-context] Multistandard PDF

[Robin Schwab]

Hi,
I am looking for a LaTeX system that can create accessible PDF so I 
tried ConTeXt.
In current ConTeXt it seems to be impossible to specify more than one
\setupbackend[format

Minimal example:
\setupbackend[format={pdf/a-3a,pdf/ua-1,pdf/x-4}]

\starttext

\input knuth

\stoptext

I get an error:
backend > profiles > error, format 'pdf/a-3a,pdf/ua-1,pdf/x-4' is not 
supported

Why should I have to choose whether my PDF is accessible to search 
engines, the disabled or the print-shop? Shouldn't everybody be able to 
access my document?

Regards

Robin

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