Re: Questions on BNF

Dave Miller wrote:
> 
> 1. ddx(). In the BNF we now mention explicitly the arguments
> to the analog_filter_functions. But it now allows the second
> argument of ddx() to be a branch_probe_function_call which
> allows things like: ddx(expr, V(a,b)); (before it had to be
> the flow of a branch or potential of a single pin).
> Is this intended, should the BNF change, or should I just make
> the restriction in the text of the document (I couldn't figure
> out how to define the BNF to enforce this - I(br1), V(a)).

This is not intended; ddx should only be allowed for V(a)
where "a" is a node (not a branch) or I(br1).  (Though
V can be any potential access function, not just the one
for the electrical discipline, same for I).

-Geoffrey