WebFeb 8, 2024 · Context free grammars are not closed under "difference" or "complements". So while you might decide to add an operator "subtract" to your BNF, the result will not be a context free grammar even if it has a simple way to express it. Consequence: people don't allow such operators in BNF grammars used to express context-free grammars. British National Formulary (BNF) British National Formulary for Children (BNFC) Clinical Knowledge Summaries (CKS) Knowledge resources; About NICE; Into practice; Get involved with NICE; Jobs; News; Newsletters and alerts; Contact us; Leave feedback; Reusing our content; NICE UK Open Content Licence; Syndicate our content
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Derivations in BNF - Software Engineering Stack Exchange
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