PowerLoom's BNF usage

I've been digging into Chapter 11 of the manual, in order to
write a second-level parser (ie, recognize logsent, etc.).

The BNF isn't exactly standard (or even correct in some places),
so I have been getting confused about some rather basic things.
Can someone confirm or deny (and then clarify) these statements?

asterisk "*"

  An asterisk means "zero or more of this item".

braces "{...}"

  Braces mean "zero or more of these items".

brackets "[...]"

  Brackets mean "zero or one of these items".

parentheses "(...)"

  Parentheses stand for themselves,
  rather than acting as grouping operators.

plus sign "+"

  A plus sign means "one or more of this item".

-r
-- 
http://www.cfcl.com/rdm            Rich Morin
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