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Meaning of EXTENDED BACKUS-NAUR FORM

 
Computing Dictionary
 
 Definition: 

Any variation on the basic backus-naur form (BNF) meta-syntax notation with (some of) the following additional constructs: square brackets "[..]" surrounding optional items, suffix "*" for kleene closure (a sequence of zero or more of an item), suffix "+" for one or more of an item, curly brackets enclosing a list of alternatives, and 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.

 

 

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