metasyntax การใช้

• Metasymbols provide syntactic information for denotational purposes in a given metasyntax.
• The structure of sentences and phrases in a metalanguage can be described by a metasyntax.
• These metalanguages have their own metasyntax each composed of terminal symbols, nonterminal symbols, and " metasymbols ".
• There are only certain formal metalanguages used for describing recursive languages ( formally called context-free languages ) that have terminals, nonterminals, and metasymbols in their metasyntax.