Quote: 2-level van Wijngaarden grammars define meta rules that generate BNF rules

Note

2 level van Wijngaarden grammar (used in algo168) defines meta rules which specify a possibly infinite class of BNF rules, e.g., 'TYPE::real, int'. 'TYPE left part list: TYPE left part; TYPE left part list'. 'TYPE left part' says all elements of a real left part list are real, same with integers

Additional Titles

Quote: with van Wijngaarden grammars can specify that all variables in a declaration list have the given type

Related Topics

Topic: decomposition of a system into levels (49 items)
Topic: van Wijngaarden grammar (9 items)