Formal Languages and Translators
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Internal
Formal Grammars
A set of production rules that describe all possible strings in a given formal language. The rules describe how to form strings from the language's alphabet that are valid according to the language syntax. The grammar does not describe the meaning of strings, or what can be done with them in whatever context, only their form.
Context-Free Grammar
A context-free grammar is a grammar in which the left-hand side of each production rule consists of only a single nonterminal symbol. A popular notation for context-free grammar is Backus-Naur (BNF).
Backus-Naur Form
Backus-Naur form is notation technique for context-free grammars that is used to describe the syntax of languages used in computing.