Richard Lawrence <richard.lawre...@berkeley.edu> writes: > Sorry, I may not have emphasized this enough, but in the grammar, I wrote: > > - A KEY optionally begins with `-', and obligatorily contains `@' or > `&' followed by a string of characters which begins with a letter > or `_', and may contain alphanumeric characters and the following > *internal* punctuation characters: > :.#$%&-+?<>~/ > > The `internal' here was meant to express exactly what Aaron said: keys > can contain punctuation, but may not end (or begin) with punctuation.
OK. I misunderstood the "internal" part. What about "@_" and "@a" ? Are they valid keys? Regards,
