Clarify that empty bars are not permitted.

[ahankinson]

e.g., You can't do //////

[BaMikusi]

But please make an exception for the double bar line.

[ahankinson]

Could you clarify that?

We just chatted about this on our morning call, and noted that the above could be interpreted as either 6 singles, or 3 doubles. Two slashes will obviously be allowed, but three + will not, without any intervening characters.

[BaMikusi]

I really just meant to point out that // must be OK in the code string, since that's the double bar line and not an empty bar (from the minimalist title and desciption it was not obvious whether this had been considered).

[lpugin]

It also think that the sentence

Bar lines SHOULD be inserted at intervals that correspond to the current time signature. 

is out of scope for the specs.