On 21 jun 2008, at 15:31, Lawrence Conroy wrote:
the SHOULD means "do this unless...", and the last phrase covers the "unless".
I had read 2119 to mean that a MUST was unconditional - do this or be non-complaint. Do you believe that MUST can have an "unless" clause? Doesn't this mean that any SHOULD with an explicit "unless" will need to be changed into a MUST - could you expand on this, please?
The difference is that with a SHOULD, the reader may come up with her own "unless".
Also note the difference between the two sides in a client-server protocol. I recently used SHOULD where I would have liked to use MUST but existing clients don't conform to the MUST so I used SHOULD to indicate that servers must support clients that don't have the feature.
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