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| Allegro CL

| 1 Introduction 1.4 Definitions 1.4.1 Notational Conventions 1.4.1.2 Modified BNF Syntax ### 1.4.1.2.2 Indirection in Modified BNF Syntax An indirection extension is introduced in order to make this new syntax more readable: O If O is a non-terminal symbol, the right-hand side of its definition is substituted for the entire expression O. For example, the following BNF is equivalent to the BNF in the previous example: `(x [[O]] y)` O::= `A` | `B`* | `C`

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