如下lambda表达式用了一种通用的方法来描述编程语言的语法,我忘记了这个术语,能告诉我吗?

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parameter_list            ::=  defparameter ("," defparameter)* "," "/" ["," [parameter_list_no_posonly]] | parameter_list_no_posonly

conditional_expression ::=  or_test ["if" or_test "else" expression]
expression             ::=  conditional_expression | lambda_expr


lambda_expr ::=  "lambda" [parameter_list] ":" expression
麻烦请教一下这个是什么通用描述方法?
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