On 2012-03-24 11:18, Alexey Melnikov wrote:
...
I think this is fine. And you can enforce "can't be totally null" in
prose, if you don't want to fix this in ABNF.
...
There will always be constraints not checkable in the ABNF.
I recommend to keep the ABNF simple (in particular not to include
syntactical constructs that vary by parameter name :-), and put all
other constraints either into prose, or into separate ABNF rules for
specific parameter values.
Best regards, Julian
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