Query String format still undefined ?

Hi all,

does anybody know where the query string format is defined ? I do not 
mean which chars are allowed and which ones are reserved. What I mean 
is, where is the format ?name=value&name=value ... defined e.g. as a 
BNF? I searched through all related RFCs even through CGI and could not 
find it. I found a lot of references to query string, but they all say 
more or less that first it depends on the scheme or even url or second 
only define the allowed chars.

I apologize if this is not the correct mailing list. Maybe then you 
could give me a hint who to ask ?

Thanks

Stephan