Computing (FOLDOC) dictionary
Extended Backus-Naur Form
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meta-syntax notation with (some of) the following additional
more of an item), suffix "+" for one or more of an item,
super/subscripts indicating between n and m occurrences.
All these constructs can be expressed in plain BNF using extra
productions and have been added for readability and
succinctness.
(1995-04-28)