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2. Terminal and nonterminal symbols - Wikipedia

   en.wikipedia.org/wiki/Terminal_and_nonterminal...

   A formal language defined or generated by a particular grammar is the set of strings that can be produced by the grammar and that consist only of terminal symbols. Diagram 1 illustrates a string that can be produced with this grammar. Diagram 1. The string Б Б Б Б was formed by the grammar defined by the given production rules. This grammar ...

3. Syntax diagram - Wikipedia

   en.wikipedia.org/wiki/Syntax_diagram

   The representation of a grammar is a set of syntax diagrams. Each diagram defines a "nonterminal" stage in a process. There is a main diagram which defines the language in the following way: to belong to the language, a word must describe a path in the main diagram. Each diagram has an entry point and an end point.

4. Noncontracting grammar - Wikipedia

   en.wikipedia.org/wiki/Noncontracting_grammar

   A context-sensitive grammar is a noncontracting grammar in which all rules are of the form αAβ → αγβ, where A is a nonterminal, and γ is a nonempty string of nonterminal and/or terminal symbols. However, some authors use the term context-sensitive grammar to refer to noncontracting grammars in general. [1]

5. Node (linguistics) - Wikipedia

   en.wikipedia.org/wiki/Node_(linguistics)

   Construction grammar; Functional discourse grammar; Grammaticalization; ... and the former are called nonterminal nodes and the latter terminal nodes. [2]

6. Context-free grammar - Wikipedia

   en.wikipedia.org/wiki/Context-free_grammar

   Nonterminal symbols are blue and terminal symbols are red. In formal language theory, a context-free grammar (CFG) is a formal grammar whose production rules can be applied to a nonterminal symbol regardless of its context. In particular, in a context-free grammar, each production rule is of the form

7. Unrestricted grammar - Wikipedia

   en.wikipedia.org/wiki/Unrestricted_grammar

   An unrestricted grammar is a formal grammar = (,,,), where . is a finite set of nonterminal symbols,; is a finite set of terminal symbols with and disjoint, [note 1]; is a finite set of production rules of the form , where and are strings of symbols in and is not the empty string, and